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U. Hebisch. Forschungsbericht, Mathematik-Bericht 91/2. Technische Universität Clausthal, Technische Universität Clausthal, Institut für Mathematik, Erzstraße 1, 3392 Clausthal-Zellerfeld, (October 1991)
Y. Kalfoglou, and M. Schorlemmer. Proceedings of the 13th International Conference on Conceptual Structures (ICCS'05), Springer LNAI 3596, Kassel, Germany, page 107--119. (July 2005)
C. Sacarea, R. Meza, and M. Cimpoi. Automation, Quality and Testing, Robotics, 2008. AQTR 2008. IEEE International Conference on, 3, page 234 -238. (May 2008)