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\bibitem{1666} Muhammad Anwer Rao, David Vazquez and Antonio Lopez. 2011. Opponent Colors for Human Detection. \textit{In} J. Vitria, J.M. Sanches and M. Hernandez, \textit{eds}. \textit{5th Iberian Conference on Pattern Recognition and Image Analysis}. Berlin Heidelberg, Springer, 363--370. (LNCS.)

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