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

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