H. Ehrig, R. Heckel, M. Llabrés, and F. Orejas, Basic Properties of Double Pullback Graph Transitions. Technical University of Berlin, 1999.

G. Engels, R. Hücking, S. Sauer, and A. Wagner, UML Collaboration Diagrams and Their Transformation to Java. University of Paderborn, Department of Computer Science, 1999.

G. Engels, P. Jan t’Hoen, R. Dassen, L. Groenewegen, I. G. Sprinkhuizen-Kuyper, and P. Koopman, SOCCA Extended with UML like Packages. Leiden Institute of Advanced Computer Science, 1999, pp. 99–06.

G. Engels, R. Dassen, L. Groenewegen, I. G. Sprinkhuizen-Kuyper, P. Koopman, and P. Jan t’Hoen, A Formalisation of SOCCA using Z, part 1: The Type Level Concepts. Leiden Institute of Advanced Computer Science, 1999.

S. Sauer and G. Engels, “UML-basierte Modellierung von Multimediaanwendungen,” in Modellierung 1999, Workshop der Gesellschaft für Informatik e. V. (GI), März 1999 in Karlsruhe, 1999, pp. 155–170.

S. Sauer and G. 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), 1999, pp. 64–71.

A. Corradini, M. Große-Rhode, and R. Heckel, “An Algebra of Graph Derivations using Finite (co-) limit Double Theories,” in Selected papers of the 13th International Workshop on Recent Trends in Algebraic Development Techniques (WADT 1998), Lisbon (Portugal), 1999, vol. 1589, pp. 92–106.

A. Corradini, R. Heckel, and U. Montanari, “From SOS Specifications to Structured Coalgebras: How to Make Bisimulation a Congruence,” in Proceedings of the 2nd workshop on Coalgebraic Methods in Computer Science (CMCS 99), 1999, vol. 19, pp. 118–141.

G. Engels, R. Heckel, and S. Sauer, “Dynamic Meta Modelling: A Graphical Approach to Operational Semantics,” in Proceedings of the workshop on Rigorous Modeling and Analysis with the UML: Challenges and Limitations (satellite event of the Conference on Onject-Oriented Programming, Systems, Languages, and Applications (OOPSLA 1999)), Denver, CO (USA), 1999.

G. Engels and S. Sauer, “MVC-Based Modeling Support for Embedded Real-Time Systems,” in Proceedings of OMER Workshop, Herrsching, Germany, 1999, no. 01, pp. 11–14.