In: KnowTechForum´99, International Knowledge Technology Forum, Potsdam, Germany. International Conference on Knowledge Management and Knowledge Technology (KnowTech), 9/1999.
In: SEKE'99 The Eleventh International Conference on Software and Knowledge Engineering. International Conference on Software Engineering and Knowledge Engineering (SEKE), Kaiserslautern, 6/1999.
In: Jos F. Schreinemakers; Jean-Paul Barthès (Hrsg.). Knowledge Management: enterprise, network, and learning. International Symposium on Management of Industrial and Corporate Knowledge (ISMICK), Würzburg: Ergon, Pages 109-116, Advances in Knowledge Management, Vol. 2, 1999.
In: Neil V.Murray (Hrsg.). Automated Reasoning with Analytic Tableaux and Related Methods, International Conference (TABLEAUX'99). International Conference on Automated Reasoning with Analytic Tableaux and Related Methods (TABLEAUX), Saratoga Springs, Pages 217-231, LNAI 1617, Springer, 6/1999.
In: Françoise Bellegarde; Olga Kouchnarenko (Hrsg.). Workshop on Modelling and Verification, C.I.S. Workshop on Modelling and Verification, Besançon, 1999.
In: H. Ganzinger (Hrsg.). Proceedings 16th International Conference on Automated Deduction, CADE-16. International Conference on Automated Deduction (CADE), Trento, Springer-Verlag, LNAI 1632, 1999.