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Hidders, Jan and Kwasnikowska, N. and Sroka, J. and Tyszkiewicz, J. and Van den Bussche, J. (2005) Petri net + nested relational calculus = dataflow. In: Meersman, R. and Tari, Z. and Hacid, M.-S. and Mylopoulos, J. and Pernici, B. and Babaoglu, O. and Jacobsen, H.-A. and Loyall, J.P. and M., Kifer and Spaccapietra, S. (eds.) On the Move to Meaningful Internet Systems 2005. Lecture Notes in Computer Science 3760. Springer, pp. 220-237. ISBN 9783540297369.
Costantini, S. and Otero, R.P. and Provetti, Alessandro and Cao Son, T. (2002) Disjunctive logic programs with inheritance revisited. In: Otero, R.P. and Hacid, M.-S. and Ras, Z.W. and Zighed, D.A. and Kodratoff, Y. (eds.) Foundations of Intelligent Systems, 13th International Symposium: ISMIS 2002. Lecture Notes in Computer Science 2366. Springer, 294-294--302. ISBN 9783540437857.