Witsenburg, Bob C.Kummer, Karl-ReinhardAlbonico, HansueliFischer, KlausGrosshans, SibylleSchwarz, ReinhardPohl, Hans JoachimErasmy, Hedwig2024-10-162024-10-161992-09https://hdl.handle.net/20.500.14430/723http://purl.org/coar/access_right/c_16ec