Guo, T., H. Zhang, B. Yoo, Y. Liu, Y. Kwak, and J.-J. Han. “Order Regularization on Ordinal Loss for Head Pose, Age and Gaze Estimation”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 35, no. 2, May 2021, pp. 1496-04, doi:10.1609/aaai.v35i2.16240.