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\bibitem{687} Fadi Dornaika, Francisco Javier Orozco, \& Jordi Gonzalez. (2006). Combined Head, Lips, Eyebrows, and Eyelids Tracking Using Adaptive Appearance Models. In \textit{IV Conference on Articulated Motion and Deformable Objects (AMDO{\textasciiacute}06), LNCS 4069: 110{\textendash}119}.

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