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Classification and Selection of Consumer Purchase Behaviour Models Gaul, W.; Decker, R. 1989. Conceptual and numerical analysis of data - proceedings of the 13th conference of the Gesellschaft für Klassifikation e.V., University of Augsburg, April 10 - 12, 1989. Ed.: O. Opitz, 389–398, Springer Verlag
An approach to knowledge-based ASIC specification Mueller-Glaser, K. D.; Bortolazzi, J. 1989. Proceedings of the IEEE 1989 Custom Integrated Circuits Conference, 15-18 May 1989, San Diego, CA, 19.2/1–4, American Physical Society (APS)