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\bibitem{2654} Ramin Irani, Kamal Nasrollahi, Chris Bahnsen, D.H. Lundtoft, Thomas B. Moeslund, Marc O. Simon, et al. (2015). Spatio-temporal Analysis of RGB-D-T Facial Images for Multimodal Pain Level Recognition. In \textit{2015 IEEE Conference on Computer Vision and Pattern Recognition  Worshops (CVPRW)} (pp. 88--95).

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