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\bibitem{1666} Muhammad Anwer Rao, David Vazquez, \& Antonio Lopez. (2011). Opponent Colors for Human Detection. In J. Vitria, J.M. Sanches, \& M. Hernandez (Eds.), \textit{5th Iberian Conference on Pattern Recognition and Image Analysis} (Vol. 6669, pp. 363--370). LNCS. Berlin Heidelberg: Springer.

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