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\bibitem{991} Joan Mas, J.A. Jorge, Gemma Sanchez, \& Josep Llados. (2008). Representing and Parsing Sketched Symbols using Adjacency Grammars and a Grid-Directed Parser. In J.M. Ogier J. L. W. Liu (Ed.), \textit{Graphics Recognition: Recent Advances and New Opportunities,} (Vol. 5046, pp. 176--187). LNCS.

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