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\bibitem{449} David Masip, \& Jordi Vitria. (2004). Classifier Combination Applied to Real Time Face Detection and Classification. In \textit{Recerca Automatica, Visio i Robotica, Ed. UPC, A. Grau, V. Puig (Eds.), 345{\textendash}353, ISBN 84{\textendash}7653{\textendash}844{\textendash}8}.

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