E. Verharen, H. Weigand, and O. Troyer. Proceedings of the IS-CORE Workshop on Information Systems - Correctness and Reusability, Amsterdam, September 26-30, 1994, (1994)
W. Tepfenhart. Proceedings of the Fifth International Conference on
Conceptual Structures, University of Washington, Seattle, August 3--8,
1997, page 125--137. Springer-Verlag, (1997)
A. de Moor, and H. Weigand. Proceedings of the 32nd Hawaii International Conference
on System Sciences (HICSS-32), Maui, Hawaii, January 5-8, 1999, (1999)
N. der Rijst. Proceedings of the Second International Workshop on
Communication Modelling, the Language/Action Perspective (LAP'97),
Veldhoven, The Netherlands, June 9-10, 1997, page 1--12. (1997)
A. de Moor. Proceedings of the Fifth International Conference on
Conceptual Structures, University of Washington, Seattle, August 3--8,
1997, page 536--550. Springer-Verlag, (1997)Lecture Notes in Artificial Intelligence No. 1257.
F. Lehmann. Proceedings of the Third International Workshop on
PEIRCE: A Conceptual Graphs Workbench, University of Maryland,
Maryland, August 19, 1994, (1994)
M. Klein. Proceedings of the Second International Conference on the Design of Cooperative Systems (COOP'96), Juan-les-Pins, France, June 12-14, page 705-722. (1996)