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\bibitem{2221} Francisco Javier Orozco, Ognjen Rudovic, Jordi Gonzalez, \& Maja Pantic. (2013). Hierarchical On-line Appearance-Based Tracking for 3D Head Pose, Eyebrows, Lips, Eyelids and Irises. \textit{IMAVIS - Image and Vision Computing}, \textit{31}(4), 322--340.

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