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\bibitem{1174} Miquel Ferrer, Ernest Valveny and F. Serratosa. 2009. Median Graph Computation by  means of a Genetic Approach Based on Minimum Common Supergraph and  Maximum Common Subraph. \textit{4th Iberian Conference on Pattern Recognition and Image Analysis}. Springer Berlin Heidelberg, 346--353. (LNCS.)

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