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\bibitem{2126} Klaus Broelemann, Anjan Dutta, Xiaoyi Jiang, \& Josep Llados. (2012). Hierarchical graph representation for symbol spotting in graphical document images. In \textit{Structural, Syntactic, and Statistical Pattern Recognition, Joint IAPR International Workshop} (Vol. 7626, pp. 529--538). LNCS. Springer Berlin Heidelberg.

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