1. W. V. Friesen, P. Ekman, Emfacs: emotional facial action coding system(1983).
2. Compound facial expressions of emotion;Du;Proc. Natl. Acad. Sci. USA,2014
3. P. Ekman, W.V. Friesen, Manual for the facial action coding system(1978).
4. Spectral networks and locally connected networks on graphs;Bruna,2014
5. Convolutional neural networks on graphs with fast localized spectral filtering;Defferrard,2016