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(Stand Januar 2021)


Christian Winkler ist der HCI Gruppe im September 2010 beigetreten. Davor hat er als Entwickler für Onlineservices in einer Agentur gearbeitet und in der Pervasive Computing-Gruppe an der Universität Duisburg-Essen unter der Leitung von Prof. Albrecht Schmidt. In 2011 hat er eine Zeit lang als Forschungsassistent und danach als Berater für Microsoft Research in Cambridge, UK gearbeitet.

Christian hat einen B.Sc. in Medieninformatik & Design (2007) von der Universität Bielefeld und einen M.Sc. in Angew. Informatik - Systems Engineering der Universität Duisburg-Essen (2010). Der Titel seiner Masterarbeit lautete: SENSE-SATION: An Extensible Platform for the Integration of Phones into the Web (siehe Publikationen).


We present PocketThumb, a wearable touch interface for smart-eyewear that is embedded into the fabrics of the front trouser pockets. The interface is reachable from outside and inside of the pocket to allow for a combined dual-sided touch input

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We present FaceTouch, a mobile Virtual Reality (VR) headmounted display (HMD) that leverages the backside as a touch-sensitive surface. FaceTouch allows the user to point at and select virtual content inside their field-of-view by touching the corresponding location at the backside of the HMD utilizing their sense of proprioception. This allows for a rich interaction (e.g. gestures) in mobile and nomadic scenarios without having to carry additional accessories (e.g. gamepad). We built a prototype of FaceTouch and present interaction techniques and three example applications that leverage the FaceTouch design space.


Glass Unlock is a novel concept using smart glasses for smartphone unlocking, which is theoretically secure against smudge attacks, shoulder-surfing, and camera attacks. By introducing an additional temporary secret like the layout of digits that is only shown on the private near-eye display, attackers cannot make sense of the observed input on the almost empty phone screen.

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We introduce the concept of an Ambient Mobile Pervasive Display (AMP-D) which is a wearable projector system that constantly projects an ambient information dis- play in front of the user. The floor display provides serendipitous access to public and personal information. The display is combined with a projected display on the user’s hand, forming a continuous interaction space that is controlled by hand gestures. The AMP-D prototype illustrates the involved challenges concerning hardware, sensing, and visualization and shows several application examples.


In this work we present SurfacePhone; a novel configuration of a projector phone which aligns the projector to project onto a physical surface to allow ad-hoc tabletop-like interaction in a mobile setup. The projection is created behind the upright standing phone and is touch and gesture-enabled. Multiple projections can be merged to create shared spaces for multi-user collaboration.

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In many contexts, pen and paper are the ideal option for collecting information despite the pervasiveness of mobile devices. Reasons include the unconstrained nature of sketching or handwriting, as well as the tactility of moving a pen over a paper that supports very fine granular control of the pen. In particular in the context of hospitals, many writing and note taking tasks are still performed using pen and paper. This work presents the Penbook concept, detail specific applications in a hospital context, and present a prototype implementation of Penbook.

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Projector phones, mobile phones with built-in projectors, might significantly change the way we are going to use and interact with mobile phones. This project explores the potential of combining the mobile and the projected display and further the potential of the mid-air space between them for the first time. Results from two studies with several gesture pointing techniques indicate that interacting behind the phone yields the highest performance, albeit showing a twice as high error rate. Further they show that mobile applications benefit from the projection, e.g., by overcoming the fat-finger problem on touchscreens and increasing the visibility of small objects. 


Smartphones provide large amounts of personal data, functionalities, but during phone calls the phone cannot be used much beyond voice communication and does not offer support for synchronous collaboration. This is owed to the fact that first, despite the availability of alternatives, the phone is typically held at one’s ear; and second that the small mobile screen is less suited to be used with existing collaboration software. This work presents a novel in-call collaboration system that leverages projector phones as they provide a large display that can be used while holding the phone to the ear to project an interactive interface anytime and anywhere.





  • Pervasive Computing - SS 2010
  • Pervasive Case Studies - SS 2010
  • User Interface Engineering 1 - WS 2010/11
  • Pervasive Computing - SS 2011
  • User Interface Engineering 2 - WS 2011/12



  • Interactive Phone Call (Master Thesis 2011)
  • NaviBeam: Indoor Assistance and Navigation for Shopping Malls trough Projector Phones (Bachelor Thesis 2011)
  • Comparison of Pointing Techniques with Projector Phones (Bachelor Thesis 2011)
  • Traffic information by means of parasitic sensing - Using sensors, data mining and machine learning on ubiquitous smartphones to recognize people's mode of transportation (Bachelor Thesis 2012)
  • Development and Evaluation of Hand-Tracking and Hand-Projection above Multitouch-Tables for Interactive User Support (Bachelor Thesis 2012)
  • Development of Application Scenarios for Camera-based Finger Tracking on an iPhone with Integrated Pico-Projector. (Bachelor Thesis 2012)
  • cRing - Ein berührungsempfindlicher Fingerring zur Gestenbasierten Interaktion mit verschiedenen untereinander vernetzten Smart-Device. (Bachelor Thesis 2014)
  • Development and Evaluation of a Wrist-worn Projector-Camera System Enabling Augmented Reality. (Master Thesis 2014)
  • Extended Mobile Interaction. (Master Thesis 2014)
  • Smart, Smarter, Smartest? An Exploration of the Design Space and Development of Interactions Between Multiple Smart Gadgets (Bachelor Thesis 2014)

Bei Interesse an einem Thema für eine Abschlussarbeit im Bereich Augmented Reality, insbesondere mittels Personal Projection oder Head-Mounted-Displays, kontaktieren Sie mich bitte per Email um ein Treffen zu vereinbaren.

Scientific Activities


  • Member of the "Association for Computing Machinery" (ACM)
  • Member of the "Institute of Electrical and Electronics Engineers" (IEEE)

Program Committee Member:

  • Mensch&Computer 2015
  • ACM MUM 2013
  • IEEE IOT 2014, 2015

Academic Internships:

  • Microsoft Research Cambridge (2011)

Reviewer for:

  • IEEE Pervasive Computing Magazine
  • IEEE Internet Computing Magazine
  • CHI 2012, 2013, 2014, 2015
  • Mobile HCI 2011, 2012, 2013, 2014
  • UIST 2011
  • ITS 2011
  • IOT 2010, 2014, 2015
  • MUM 2012, 2013
  • AML 2012
  • AVI 2013
  • SUI 2014
  • Siggraph ASIA 2014


  • CHI 2015 (Seoul)
  • CHI 2014 (Toronto)
  • CHI 2013 (Paris)
  • MUM 2012 (ULM)
  • ITS 2012 (Cambridge, Boston, MA)
  • Mobile HCI 2012 (San Francisco)
  • ITS 2011 (Kobe)
  • Personal Projection Workshop (Oulu)
  • Mobile HCI 2011 (Stockholm)
  • CHI 2011 (Vancouver)
  • IOT 2010 (Tokyo)
  • UbiComp 2010 (Copenhagen)
  • Mobile HCI 2010 (Lissabon)
  • Mobile HCI 2009 (Bonn)


% % This file was created by the TYPO3 extension % publications % --- Timezone: CEST % Creation date: 2023-06-04 % Creation time: 05:20:24 % --- Number of references % 23 % @Article { Pointing, author = {Plaumann, Katrin and Weing, Matthias and Winkler, Christian and M\{\"\{u\}\}ller, Michael and Rukzio, Enrico}, title = {Towards Accurate Cursorless Pointing: The Effects of Ocular Dominance and Handedness}, year = {2018}, month = {8}, DOI = {10.1007/s00779-017-1100-7}, journal = {Personal and Ubiquitous Computing}, volume = {22}, publisher = {Springer}, pages = {633–646}, number = {4}, web_url = {http://link.springer.com/article/10.1007/s00779-017-1100-7}, file_url = {https://www.uni-ulm.de/fileadmin/website\_uni\_ulm/iui.inst.100/institut/mitarbeiterbereiche/plaumann/PUC\_2017.pdf} } @Article { pocketthumb, author = {Dobbelstein, David and Winkler, Christian and Haas, Gabriel and Rukzio, Enrico}, title = {PocketThumb: a Wearable Dual-Sided Touch Interface for Cursor-based Control of Smart-Eyewear}, year = {2017}, month = {6}, DOI = {10.1145/3090055}, journal = {Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies (IMWUT)}, web_url = {https://www.uni-ulm.de/in/mi/mi-forschung/uulm-hci/projects/pocketthumb-a-wearable-dual-sided-touch-interface-for-cursor-based-control-of-smart-eyewear/}, web_url2 = {https://youtu.be/Ep0GUToErJg}, file_url = {https://www.uni-ulm.de/fileadmin/website\_uni\_ulm/iui.inst.100/institut/mitarbeiterbereiche/dobbelstein/pocketThumb.pdf} } @Inbook { CompanionBookB5, author = {Gugenheimer, Jan and Winkler, Christian and Wolf, Dennis and Rukzio, Enrico}, title = {Interaction with Adaptive and Ubiquitous User Interfaces}, year = {2017}, isbn = {978-3-319-43665-4}, DOI = {10.1007/978-3-319-43665-4\_11}, booktitle = {Companion Technology - A Paradigm Shift in Human-Technology Interaction}, publisher = {Springer}, chapter = {11}, editor = {Biundo, Susanne, and Andreas Wendemuth}, pages = {209-229}, web_url2 = {https://www.uni-ulm.de/index.php?id=92261}, file_url = {https://www.uni-ulm.de/fileadmin/website\_uni\_ulm/iui.inst.100/institut/mitarbeiterbereiche/wolf/CompanionBookB5Chapter.pdf} } @Article { demopocketthumb, author = {Dobbelstein, David and Winkler, Christian and Haas, Gabriel and Rukzio, Enrico}, title = {Demonstration of PocketThumb: a Wearable Dual-Sided Touch Interface for Cursor-based Control of Smart-Eyewear}, year = {2017}, DOI = {10.1145/3123024.3123185}, journal = {Proc. of UbiComp/ISWC 2017 Adjunct (Demo), ACM, 4 pages}, web_url = {https://youtu.be/Ep0GUToErJg}, file_url = {https://www.uni-ulm.de/fileadmin/website\_uni\_ulm/iui.inst.100/institut/mitarbeiterbereiche/dobbelstein/pocketthumb\_demo.pdf} } @Article { ftUIST, author = {Gugenheimer, Jan and Dobbelstein, David and Winkler, Christian and Haas, Gabriel and Rukzio, Enrico}, title = {FaceTouch: Enabling Touch Interaction in Display Fixed UIs for Mobile Virtual Reality}, year = {2016}, month = {10}, DOI = {10.1145/2984511.2984576}, journal = {In Proceedings of UIST 2016 (ACM Symposium on User Interface Software and Technology)}, web_url = {https://www.uni-ulm.de/en/in/mi/mi-forschung/research-group-rukzio/projects/facetouch-touch-interaction-for-mobile-virtual-reality/}, web_url2 = {https://youtu.be/MHbN9lseHYE}, file_url = {https://www.uni-ulm.de/fileadmin/website\_uni\_ulm/iui.inst.100/institut/Papers/Prof\_Rukzio/2016/p49c.pdf} } @Article { FaceTouchDemo, author = {Gugenheimer, Jan and Dobbelstein, David and Winkler, Christian and Haas, Gabriel and Rukzio, Enrico}, title = {FaceTouch: Touch Interaction for Mobile Virtual Reality}, year = {2016}, month = {5}, DOI = {10.1145/2851581.2890242}, journal = {In Adj. Proc. (Demo) of CHI 2016 (SIGCHI Conference on Human Factors in Computing Systems)}, web_url = {https://www.uni-ulm.de/en/in/mi/mi-forschung/research-group-rukzio/projects/facetouch-touch-interaction-for-mobile-virtual-reality/}, web_url2 = {https://youtu.be/tvAjOvXB56c}, file_url = {https://www.uni-ulm.de/fileadmin/website\_uni\_ulm/iui.inst.100/institut/Papers/Prof\_Rukzio/2016/FaceTouchGugenheimer.pdf} } @Phdthesis { christian_diss_2016, author = {Winkler, Christian}, title = {Nomadic projection within reach - overcoming deficiencies in nomadic information management through mobile projected interfaces}, type = {Dissertation}, year = {2016}, DOI = {10.18725/OPARU-3260}, school = {University of Ulm}, web_url = {https://oparu.uni-ulm.de/xmlui/handle/123456789/3287}, file_url = {https://www.uni-ulm.de/fileadmin/website\_uni\_ulm/iui.inst.100/institut/Papers/Prof\_Rukzio/2016/ChristianWinklerDissSmall.pdf} } @Article { UbiBeamInteract, author = {Gugenheimer, Jan and Knierim, Pascal and Winkler, Christian and Seifert, Julian and Rukzio, Enrico}, title = {UbiBeam: Exploring the Interaction Space for Home Deployed Projector-Camera Systems }, year = {2015}, month = {10}, day = {14}, DOI = {10.1007/978-3-319-22698-9\_23}, journal = {In Proc. of Interact 2015 (IFIP TC15 Conference on Human-Computer Interaction)}, web_url = {https://youtu.be/t-2ddmX5s2M}, web_url2 = {https://www.uni-ulm.de/en/in/mi/mi-forschung/research-group-rukzio/projects/ubibeam-an-interactive-projector-camera-system-for-domestic-deployment/}, file_url = {https://www.uni-ulm.de/fileadmin/website\_uni\_ulm/iui.inst.100/institut/Papers/Prof\_Rukzio/2015/UbiBeam.pdf} } @Conference { winkler_CHI2015_glassunlock, author = {Winkler, Christian and Gugenheimer, Jan and De Luca, Alexander and Haas, Gabriel and Speidel, Philipp and Dobbelstein, David and Rukzio, Enrico}, title = {Glass Unlock: Enhancing Security of Smartphone Unlocking through Leveraging a Private Near-eye Display}, year = {2015}, month = {4}, DOI = {10.1145/2702123.2702316}, booktitle = {Proc. of CHI 2015 (SIGCHI Conference on Human Factors in Computing Systems)}, web_url = {https://www.uni-ulm.de/index.php?id=85251}, web_url2 = {https://www.youtube.com/watch?v=LqfbVckVUNs}, file_url = {http://www.uni-ulm.de/fileadmin/website\_uni\_ulm/iui.inst.100/institut/Papers/Prof\_Rukzio/2015/Glass\_unlock\_winkler.pdf} } @Conference { SeifertBWSSHMM2014, author = {Seifert, Julian and Boring, Sebastian and Winkler, Christian and Schaub, Florian and Schwab, Fabian and Herrdum, Steffen and Maier, Fabian and Mayer, Daniel and Rukzio, Enrico}, title = {Hover Pad: Interacting with Autonomous and Self-Actuated Displays in Space}, year = {2014}, month = {10}, day = {5}, DOI = {10.1145/2642918.2647385}, booktitle = {Proceedings of ACM Symposium on User Interface Software and Technology (UIST)}, web_url = {https://www.youtube.com/watch?v=qAS6EC7cvU8}, web_url2 = {https://www.uni-ulm.de/index.php?id=56454}, file_url = {https://www.uni-ulm.de/fileadmin/website\_uni\_ulm/iui.inst.100/institut/Papers/Prof\_Rukzio/2014/Seifert-et-al.-HoverPad.pdf} } @Conference { Schaub:2014:PCP:2632048.2632087, author = {Schaub, Florian and K\{\"\{o\}\}nings, Bastian and Lang, Peter and Wiedersheim, Bj\{\"\{o\}\}rn and Winkler, Christian and Weber, Michael}, title = {PriCal: Context-adaptive Privacy in Ambient Calendar Displays}, year = {2014}, month = {10}, isbn = {978-1-4503-2968-2}, DOI = {10.1145/2632048.2632087}, booktitle = {Proceedings of the 2014 ACM International Joint Conference on Pervasive and Ubiquitous Computing (UbiComp '14)}, publisher = {ACM}, address = {New York, NY, USA}, pages = {499--510}, keywords = {collaboration, context awareness, groupware calendar systems, mobile interaction, privacy, public displays}, file_url = {http://doi.acm.org/10.1145/2632048.2632087} } @Article { winkler2014_Springer_Tischbasierte Projektion, author = {Winkler, Christian and Rukzio, Enrico}, title = {Projizierte tischbasierte Benutzungsschnittstellen}, year = {2014}, month = {5}, day = {28}, DOI = {10.1007/s00287-014-0803-7}, journal = {Informatik-Spektrum }, pages = {1-5}, file_url = {https://www.uni-ulm.de/fileadmin/website\_uni\_ulm/iui.inst.100/institut/Papers/Prof\_Rukzio/2014/Winkler\_Rukzio\_2014\_Projizierte\_tischbasierte\_Benutzungsschnittstellen.pdf} } @Inproceedings { Winkler:2014CHIb, author = {Winkler, Christian and Loechtefeld, Markus and Dobbelstein, David and Krueger, Antonio and Rukzio, Enrico}, title = {SurfacePhone: A Mobile Projection Device for Single- and Multiuser Everywhere Tabletop Interaction}, year = {2014}, month = {4}, DOI = {10.1145/2556288.2557075}, booktitle = {Proc. of CHI 2014 (SIGCHI Conference on Human Factors in Computing Systems), ACM, 10 pages}, event_name = {CHI 2014}, web_url = {https://www.uni-ulm.de/index.php?id=85270}, web_url2 = {http://www.youtube.com/watch?v=DKofzCI7Yfw}, file_url = {/fileadmin/website\_uni\_ulm/iui.inst.100/institut/Papers/Prof\_Rukzio/2014/winkler672-surfacephone.pdf} } @Inproceedings { Winkler:2014CHIa, author = {Winkler, Christian and Seifert, Julian and Dobbelstein, David and Rukzio, Enrico}, title = {Pervasive Information through Constant Personal Projection: The Ambient Mobile Pervasive Display (AMP-D)}, year = {2014}, month = {4}, DOI = {10.1145/2556288.2557365}, booktitle = {Proc. of CHI 2014 (SIGCHI Conference on Human Factors in Computing Systems), ACM, 10 pages, Honorable Mention Award}, keywords = {Winkler:2014CHIa}, web_url = {t3://page?uid=85269 - - \dqLink to Proect Site at UUlm\dq}, web_url2 = {http://www.youtube.com/watch?v=ahG06CERqAI}, file_url = {t3://file?uid=151372} } @Inproceedings { Winkler2014_Peripheral, author = {Winkler, Christian}, title = {Peripheral Interaction On-The-Go}, year = {2014}, month = {4}, reviewed = {1}, booktitle = {Workshop on Peripheral Interaction: Shaping the Research and Design Space at CHI 2014}, web_url = {http://peripheralinteraction.com/}, file_url = {http://peripheralinteraction.com/paper/CHIWorkshop\_PI\_Winkler.pdf} } @Article { Derthick:2013:ESW:2493190.2493239, author = {Derthick, Katie and Scott, James and Villar, Nicolas and Winkler, Christian}, title = {Exploring smartphone-based web user interfaces for appliances}, year = {2013}, DOI = {10.1145/2493190.2493239}, booktitle = {Proceedings of the 15th international conference on Human-computer interaction with mobile devices and services, ACM}, journal = {Proc. of Mobile HCI'13 (15th international conference on Human-computer interaction with mobile devices and services), ACM, 10 pages}, series = {MobileHCI '13}, keywords = {appliances, smartphones, user interfaces}, file_url = {https://www.uni-ulm.de/fileadmin/website\_uni\_ulm/iui.inst.100/institut/Papers/Prof\_Rukzio/2013/p227-derthick-winkler.pdf} } @Article { WinklerSRKR2013, author = {Winkler, Christian and Seifert, Julian and Reinartz, Christian and Krahmer, Pascal and Rukzio, Enrico}, title = {Penbook: Bringing Pen+Paper Interaction to a Tablet Device to Facilitate Paper-Based Workflows in the Hospital Domain}, year = {2013}, DOI = {10.1145/2512349.2512797}, journal = {Proc. of ITS 2013 (ACM International Conference on Interactive Tabletops and Surfaces), ACM, 4 pages [Winner of Best Note Award]}, keywords = {WinklerSRKR2013}, web_url = {https://dl.acm.org/doi/abs/10.1145/2512349.2512797 - - \dqLink to ACM\dq}, web_url2 = {http://www.youtube.com/watch?v=4D207Er3H8Q}, file_url = {t3://file?uid=223330} } @Misc { villar2012customizing, author = {Villar, Nicolas and Scott, James and Hodges, Stephen and Winkler, Christian}, title = {Customizing appliances}, year = {2012}, month = {4}, howpublished = {Patent}, extern = {1}, web_url = {http://www.google.com/patents/US20130275957}, note = {US Patent App. 13/445,520} } @Conference { winkler_investigating_2012, author = {Winkler, Christian and Pfeuffer, Ken and Rukzio, Enrico}, title = {Investigating mid-air pointing interaction for projector phones.}, year = {2012}, DOI = {10.1145/2396636.2396650}, booktitle = {Proc. of ITS 2012 (ACM International Conference on Interactive Tabletops and Surfaces), ACM, 10 pages.}, web_url2 = {http://youtu.be/r51z70PRb0M}, file_url = {/fileadmin/website\_uni\_ulm/iui.inst.100/institut/Papers/Prof\_Rukzio/2012/2012\_its\_winkler.pdf} } @Inproceedings { winkler_wall_2012, author = {Winkler, Christian and Hutflesz, Patrick and Holzmann, Clemens and Rukzio, Enrico}, title = {Wall Play: a novel wall/floor interaction concept for mobile projected gaming.}, year = {2012}, DOI = {10.1145/2371664.2371687}, booktitle = {In Proc. of Mobile HCI 2012 (14th International Conference on Human-Computer Interaction with Mobile Devices and Services), ACM, 4 pages.}, file_url = {http://mobivis.labs-exit.de/AcceptedPapers/mobivis2012\_Hutflesz\_et\_al.pdf} } @Inproceedings { winkler_interactive_20110, author = {Winkler, Christian and Reinartz, Christian and Nowacka, Diana and Rukzio, Enrico}, title = {Interactive phone call: synchronous remote collaboration and projected interactive surfaces.}, year = {2011}, DOI = {10.1145/2076354.2076367}, booktitle = {In Proc. of ITS 2011 (ACM International Conference on Interactive Tabletops and Surfaces), ACM, 10 pages.}, web_url2 = {http://youtu.be/Qv6Wv8Nv6sI}, file_url = {/fileadmin/website\_uni\_ulm/iui.inst.100/institut/Papers/Prof\_Rukzio/2011/2011\_winkler\_its2011.pdf} } @Inproceedings { valderrama_bahamondez_utilizing_2011, author = {Valderrama Bahamondez, Elba del Carmen and Winkler, Christian and Schmidt, Albrecht}, title = {Utilizing multimedia capabilities of mobile phones to support teaching in schools in rural panama.}, abstract = {Providing good education is one of the major challenges for humanity. In many developing regions in the world improving educational standards is seen as a central building block for improving socio-economic situation of society. Based on our research in Panama we report on how mobile phones can be used as educational tools. In contrast to personal computers mobile phones are widely available and in Panama over 80{\%} of the children have access to phones. We report on four different studies building on one another. We conducted surveys, focus groups, and group interviews with several hundred teachers and pupils to assess opportunities, needs, and threads for using phones in teaching and learning. Based on the feedback received we created a set of use cases and finally evaluated these in a field study in a rural multigrade school in Panama. Our findings suggest that current phones with multimedia capabilities provide a valuable resource for teaching and learning across many subjects. In particular recording of audio and video, programs for drawing, and taking photos were used in very creative and constructive ways beyond the use cases envisioned by us and initial skepticism of parents turned into support.}, year = {2011}, booktitle = {In Proc. of CHI 2011 (Conference on Human Factors in Computing Systems), ACM, 10 pages.}, keywords = {developing countries, education, learning, mobile phones}, web_url = {http://dx.doi.org/10.1145/1978942.1979081}, file_url = {fileadmin/website\_uni\_ulm/iui.inst.100/institut/Papers/Prof\_Rukzio/2011/2011\_valderrama\_chi2011.pdf} } @Inproceedings { Shirazi:2009:FIS:1613858.1613965, author = {Shirazi, Alireza Sahami and Winkler, Christian and Schmidt, Albrecht}, title = {Flashlight interaction: a study on mobile phone interaction techniques with large displays}, year = {2009}, isbn = {978-1-60558-281-8}, DOI = {10.1145/1613858.1613965}, booktitle = {Proceedings of the 11th International Conference on Human-Computer Interaction with Mobile Devices and Services}, publisher = {ACM}, address = {New York, NY, USA}, series = {MobileHCI '09}, pages = {93:1--93:2}, keywords = {interaction, light, mobile phone, public display}, file_url = {http://doi.acm.org/10.1145/1613858.1613965} }

Dr. Christian Winkler


ehem. wissenschaftlicher Mitarbeiter