Ralf Kollmann

Martin Gogolla, Ralf Kollmann: Re-Documentation of Java with UML Class Diagrams, Reengineering Forum, Burlington, Massachusetts, 2000, (BibTeX entry).
Martin Gogolla, Oliver Radfelder, Ralf Kollmann, Mark Richters: Analysing Atomic Dynamic UML Notions by Surfing through the UML Metamodel, LMU München, Informatik-Bericht Nr. 0006, 2000, (BibTeX entry).
Ralf Kollmann, Martin Gogolla: Capturing Dynamic Program Behaviour with UML Collaboration Diagrams, IEEE Computer Society, 2001, (BibTeX entry).
Ralf Kollmann, Martin Gogolla: Selektive Darstellung von Programmstrukturen mit UML, Universität Koblenz, Technischer Bericht, http://www.uni-koblenz.de/~ist/WSR2001, 2001, (BibTeX entry).
Ralf Kollmann, Martin Gogolla: Application of the UML Associations and Their Adornments in Design Recovery, IEEE Computer Society, 2001, (BibTeX entry).
Ralf Kollmann, Martin Gogolla: Metric-Based Selective Representation of UML Diagrams, IEEE Computer Society, 2002, (BibTeX entry).
Ralf Kollmann, Petri Selonen, Eleni Stroulia, Tarja Systä, Albert Zündorf: A Study on the Current State of the Art in Tool-Supported UML-Based Static Reverse Engineering, IEEE Computer Society, 2002, (BibTeX entry).
Sabine Kuske, Martin Gogolla, Ralf Kollmann, Hans-Jörg Kreowski: An Integrated Semantics for UML Class, Object, and State Diagrams based on Graph Transformation, Springer, 2002, (BibTeX entry).

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