T. Graf, R. Fonk, J. Schröter, P. Hoenicke, C. Bauer, J. Kallo, C. Willich, "Investigation of a fuel cell hybrid system with a new modular test bench approach for all electric hybrid power train systems", Journal of Energy Storage, Volume 56, Part B, 2022, https://doi.org/10.1016/j.est.2022.105999

D. Frank, G. Neubauer, C. Bauer, J. Kallo, and C. Willich, “Exhaust Emission Measurements from a Spark-Ignition Engine Using Fuels with Different Ethanol Content for Aircraft Applications,” ACS Omega, Aug. 2022, doi: 10.1021/acsomega.2c02907

S. Bhattacharya, D. Anagnostou, P. Schwane, C. Bauer, J. Kallo, C. Willich, "A Flexible DC–DC Converter with Multi-Directional Power Flow Capabilities for Power Management and Delivery Module in a Hybrid Electric Aircraft", Energies 2022, 15, 5495. https://doi.org/10.3390/en15155495

S. Bhattacharya, C. Willich, J. Kallo, "Design and Demonstration of a 540 V/28 V SiC-Based Resonant DC–DC Converter for Auxiliary Power Supply in More Electric Aircraft", Electronics 11, no. 9: 1382, 2022 https://doi.org/10.3390/electronics11091382

J. Schröter, D. Frank, V. Radke, C. Bauer, J. Kallo, C. Willich, "Influence of Low Inlet Pressure and Temperature on the Compressor Map Limits of Electrical Turbo Chargers for Airborne Fuel Cell Applications", Energies 15, no. 8: 2896, 2022, https://doi.org/10.3390/en15082896

M. Hamid, B. Li, J. Xie, "Decommissioned batteries and their usage in multilevel inverters as an addition to the circular economy". Energy Storage. 2022;e327. doi:10.1002/est2.327

D. Gosh, C. Willich, J. Kallo, “Demonstration of a Novel Alternating Current Hybrid Concept for a Fuel Cell–Battery Hybrid Electric Aircraft”, Energies 2021, 14, 7350, 2021, https://doi.org/10.3390/en14217350 

P. Hoenicke, D. Gosh, A. Muhandes, S. Bhattacharya, C. Bauer, J. Kallo, C. Willich, “Power Management Control and Delivery Module for a Hybrid-electric Aircraft using Fuel Cell and Battery”, Energy Conversion and Management, Volume 244, 2021, https://doi.org/10.1016/j.enconman.2021.114445

J. Schröter, T. Graf, D. Frank, C. Bauer, J. Kallo, C. Willich, “Influence of pressure losses on compressor performance in a pressurized fuel cell air supply system for airplane applications”, International Journal of Hydrogen Energy, Volume 46, Issue 40, Pages 21151-21159, 2021, https://doi.org/10.1016/j.ijhydene.2021.03.218