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\bibitem{2698} Anjan Dutta, Josep Llados, Horst Bunke, \& Umapada Pal. (2014). A Product Graph Based Method for Dual Subgraph Matching Applied to Symbol Spotting. In Bart Lamiroy, \& Jean-Marc Ogier (Eds.), \textit{Graphics Recognition. Current Trends and Challenges} (Vol. 8746, pp. 7--11). LNCS. Springer Berlin Heidelberg.

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