Oliver Radfelder

Martin Gogolla, Oliver Radfelder, Mark Richters: Towards Three-Dimensional Animation of UML Diagrams, Second International Conference on the Unified Modeling Language: UML'99, 1999, (BibTeX entry).
Martin Gogolla, Oliver Radfelder, Mark Richters: A UML Semantics FAQ - The View from Bremen, University of Brighton, 1999, (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).
Oliver Radfelder, Martin Gogolla: On Better Understanding UML Diagrams through Interactive Three-Dimensional Visualization and Animation, ACM Press, New York, 2000, (BibTeX entry).

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