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\bibitem{2951} Pau Riba, Josep Llados and Alicia Fornes. 2017. Error-tolerant coarse-to-fine matching model for hierarchical graphs. \textit{In} Pasquale Foggia, Cheng-Lin Liu and Mario Vento, \textit{eds}. \textit{11th IAPR-TC-15 International Workshop on Graph-Based Representations in Pattern Recognition}. Springer International Publishing, 107--117.

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