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\bibitem{1744} Jaume Gibert, Ernest Valveny and Horst Bunke. 2011. Vocabulary Selection for Graph of Words Embedding. \textit{In} Vitria, J., J.M.R. Sanches and M. Hern{\'a}ndez, \textit{eds}. \textit{5th Iberian Conference on Pattern Recognition and Image Analysis}. Berlin, Springer, 216--223. (LNCS.)

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