@inproceedingsDücker_Müller_Rubart_1999, place=Maui, HI, USA , title=Innovative Concepts for Configurating Shared Workspaces through Visual Programming, DOI=10.1109/HICSS.1999.773046, booktitle= Proceedings of the 32nd Annual Hawaii International Conference on Systems Sciences, author=Dücker, M. and Müller, Wolfgang and Rubart, Jessica, year=1999 

@inproceedingsGeiger_Lehrenfeld_Müller_1999, place=Maui, Hawaii, title=Visual Specification, Modeling, and Illustrations of Complex Systems, DOI=10.1109/HICSS.1999.772621, booktitle=Proceedings of HICSS-32, author=Geiger, Christian and Lehrenfeld, G. and Müller, Wolfgang, year=1999