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\bibitem{1219} Miquel Ferrer, Ernest Valveny, F. Serratosa, I. Bardaji, \& Horst Bunke. (2009). Graph-based k-means clustering: A comparison of the set versus the generalized median graph. In \textit{13th International Conference on Computer Analysis of Images and Patterns} (Vol. 5702, pp. 342--350). LNCS. Springer Berlin Heidelberg.

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