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J. Pérez, M. Arenas, and C. Gutierrez. International Semantic Web Conference, volume 5318 of Lecture Notes in Computer Science, page 66-81. Springer, (2008)
M. Arenas, L. Bertossi, and J. Chomicki. PODS '99: Proceedings of the eighteenth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems, page 68--79. New York, NY, USA, ACM, (1999)
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P. Castillo, M. Arenas, J. Merelo, G. Romero, F. Rateb, and A. Prieto. Genetic Programming 7th European Conference, EuroGP
2004, Proceedings, volume 3003 of LNCS, page 240--249. Coimbra, Portugal, Springer-Verlag, (5-7 April 2004)