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\bibitem{CristhianA.Aguilera_etal2015} Cristhian A. Aguilera, Angel D. Sappa, \& R. Toledo. (2015). LGHD: A feature descriptor for matching across non-linear intensity variations. In \textit{IEEE International Conference on, Quebec City, QC, 2015} (pp. 178--181). Quebec City, QC, Canada: IEEE.

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