Dutta, U. K., M. Harandi, and C. Chandra Shekhar. “Semi-Supervised Metric Learning: A Deep Resurrection”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 35, no. 8, May 2021, pp. 7279-87, https://ojs.aaai.org/index.php/AAAI/article/view/16894.