Jochen Seemann

Jochen Seemann, Jürgen Wolff von Gudenberg: UMLscript: A Programming Language for Object-Oriented Design, Workshop "Einsatz, Bewertung und Stand der Unified Modeling Language (UML)", 1997, (BibTeX entry).
Jochen Seemann, Jürgen Wolff von Gudenberg: Extension of UML Sequence Diagrams for Real-Time Systems, UML'98: Beyond the Notation - International Workshop (Preliminary Proceedings), 1998, (BibTeX entry).
Jochen Seemann, Jürgen Wolff von Gudenberg: Extension of UML Sequence Diagrams for Real-Time Systems, UML'98: Beyond the Notation - International Workshop (Final Proceedings), 1998, (BibTeX entry).
Jochen Seemann: Extending the Sugiyama Algorithm for Drawing UML Class Diagrams: Towards Automatic Layout of Object-Oriented Software Diagrams, Springer, 1997, (BibTeX entry).
Jochen Seemann, Jürgen Wolff von Gudenberg: UML- Unified Modeling Language, 1998, (BibTeX entry).

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