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\bibitem{1173} Miquel Ferrer, Dimosthenis Karatzas, Ernest Valveny, \& Horst Bunke. (2009). A Recursive  Embedding Approach to Median Graph Computation. In \textit{7th IAPR {\textendash} TC{\textendash}15 Workshop on Graph{\textendash}Based Representations in Pattern Recognition} (Vol. 5534, pp. 113--123). LNCS. Springer Berlin Heidelberg.

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