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\bibitem{845} Joan Mas, J.A. Jorge, Gemma Sanchez and Josep Llados. 2007. Describing and Parising Hand-Drawn Sketches using a Syntactic Approach. \textit{In} J. Llados, W.L., J.M. Ogier, \textit{ed}. \textit{Seventh IAPR International Workshop on Graphics Recognition}.61--62.

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