Stefanie Betz Daniel Eichhorn Susan Hickl Stefan Klink Agnes Koschmider Yu Li Andreas Oberweis Ralf Trunko 3D Representation of Business Process Models. 73-87 2008 MobIS conf/mobis/2008 db/conf/mobis/mobis2008.html#BetzEHKKLOT08 http://subs.emis.de/LNI/Proceedings/Proceedings141/article2308.html