- Bernadette Bouchon-Meunier, Ronald R. Yager, Lotfi A. Zadeh, editors, Uncertainty in Knowledge Bases, 3rd International Conference on Information Processing and Management of Uncertainty in Knowledge-Based Systems, IPMU 90, Paris, France, July 2-6, 1990, Proceedings. Volume 521 of Lecture Notes in Computer Science, Springer, 1991.