P. Lucey, J. F. Cohn, T. Kanade, J. Saragih, Z. Ambadar and I. Matthews, "The Extended Cohn-Kanade Dataset (CK+): A complete dataset for action unit and emotion-specified expression," 2010 IEEE Computer Society Conference on Computer Vision and Pattern Recognition - Workshops, San Francisco, CA, 2010, pp. 94-101. doi: 10.1109/CVPRW.2010.5543262
Chinchu Thomas, Nitin Nair, and Dinesh Babu Jayagopi. 2018. Predicting Engagement Intensity in the Wild Using Temporal Convolutional Network. In Proceedings of the 20th ACM International Conference on Multimodal Interaction (ICMI '18). ACM, New York, NY, USA, 604-610. DOI: https://doi.org/10.1145/3242969.3264984