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Engels, Gregor, Roland Hücking, Stefan Sauer, and Annika Wagner. UML Collaboration Diagrams and Their Transformation to Java. University of Paderborn, Department of Computer Science, 1999.

Engels, Gregor, Pieter Jan t’Hoen, Ray Dassen, Luuk Groenewegen, Ida G. Sprinkhuizen-Kuyper, and Pieter Koopman. SOCCA Extended with UML like Packages. Leiden Institute of Advanced Computer Science, 1999.

Engels, Gregor, Ray Dassen, Luuk Groenewegen, Ida G. Sprinkhuizen-Kuyper, Pieter Koopman, and Pieter Jan t’Hoen. A Formalisation of SOCCA Using Z, Part 1: The Type Level Concepts. Leiden Institute of Advanced Computer Science, 1999.

Sauer, Stefan, and Gregor Engels. “UML-Basierte Modellierung von Multimediaanwendungen.” In Modellierung 1999, Workshop Der Gesellschaft Für Informatik e. V. (GI), März 1999 in Karlsruhe, 155–70. Karlsruhe, Germany: Teubner, Stuttgart, 1999.

Sauer, Stefan, and Gregor Engels. “OMMMA: An Object-Oriented Approach for Modeling Multimedia Information Systems.” In Proceedings of the Workshop on Multimedia Information Systems (MIS 1999), Indian Wells, CA (USA), 64–71. Indian Wells, California, USA, 1999.

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Engels, Gregor, and Stefan Sauer. “MVC-Based Modeling Support for Embedded Real-Time Systems.” In Proceedings of OMER Workshop, Herrsching, Germany, 11–14. Herrsching, Universität der Bundeswehr München, Fakultät für Informatik, 1999.

Mehner, Katharina, and Annika Wagner. “An Assessment of Aspect Language Design.” In Proceedings of the Young Researchers Workshop (Satellite Event of the Generative and Component-Based Software Engineering (GCSE 1999)), Erfurt (Germany), 1999.

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Frick, Bernd, and Martin Schneider. Zunehmende Konfliktregulierung durch Arbeitsgerichte? Eine ökonomische Analyse der Häufigkeit von Kündigungsschutzprozessen, 1999.

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Depke, Ralph, Gregor Engels, Katharina Mehner, Stefan Sauer, and Annika Wagner. “Ein Vorgehensmodell Für Die Multimedia-Entwicklung Mit Autorensystemen.”http://dx.doi.org/10.1007/s004500050128__Informatik Forschung Und Entwicklung 14, no. 2 (1999): 83–94.http://dx.doi.org/10.1007/s004500050128 .

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