Prof. em. Heinz Dieter Rudolph describes his programs for the structure determination from microwave spectra in his contribution to the recent monography entitled
"Equilibrium Molecular Structures. From Spectroscopy to Quantum Chemistry"
(Edited by J. Demaison, J. E. Boggs und A. G. Császár)
CRC Press, Boca Raton 2011, 302pp.
Free download of the software package MOMSTRUC.