Wolfgang Mueller

Stephan Flake, Wolfgang Mueller: An ASM Definition of the Dynamic OCL 2.0 Semantics, Seventh International Conference on the Unified Modeling Language - the Language and its applications, 2004, (BibTeX entry).
Stephan Flake, Wolfgang Mueller: A UML Profile for Real-Time Constraints with the OCL, Fifth International Conference on the Unified Modeling Language - the Language and its applications, 2002, (BibTeX entry).
Stephan Flake, Wolfgang Mueller: An OCL Extension for Real-Time Constraints, Springer, 2002, (BibTeX entry).
Stephan Flake, Wolfgang Mueller: Specification of Real-Time Properties for UML Models, IEEE Computer Society, 2002, (BibTeX entry).
Stephan Flake, Wolfgang Mueller: Semantics of State-Oriented Expressions in the Object Constraint Language, Knowledge Systems Institute, Skokie, USA, 2003, (BibTeX entry).

dblp: Computer Science Bibliography (University of Trier, Germany). (Note that this does not always work due to different naming schemes.)