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

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