Hierarchical Specification of Graphical User Interfaces using a Graph Grammar Approach. - Michael Goedicke; Peter Tröpfner; Bettina Eva Enders-Sucrow (Trans. SDPS, 2001)

Towards an Integration of Different Specification Methods by using the Viewpoint Framework. - Bettina Enders; Torsten Heverhagen; Michael Goedicke; Peter Tröpfner; Rudolf Tracht (Trans. SDPS, 2002)