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\bibitem{846} Mar{\c c}al Rusi{\~n}ol and Josep Llados. 2007. A Region-Based Hashing Approach for Symbol Spotting in Thechnical Documents. \textit{In} J. Llados, W.L., J.M. Ogier, \textit{ed}. \textit{Seventh IAPR International Workshop on Graphics Recognition}.41--42.

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