Liu, Jianjun, Huang, Siming, Zhang, Xin, Fu, Xiaofeng, Chang, Ching-Chun, Tang, Zhuo and Luo, Zhenxing (2020) Facial Expression Recognition by Transfer Learning for Small Datasets. Security with Intelligent Computing and Big-data Services, 895 . pp. 756-770. doi:10.1007/978-3-030-16946-6_62 ISSN 2194-5357.