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

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