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\bibitem{2497} Hongxing Gao, Mar{\c c}al Rusi{\~n}ol, Dimosthenis Karatzas, \& Josep Llados. (2014). Embedding Document Structure to Bag-of-Words through Pair-wise Stable Key-regions. In \textit{22nd International Conference on Pattern Recognition} (pp. 2903--2908).

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