Gao, Xingyu, Steven C.H. Hoi, Yongdong Zhang, Ji Wan, and Jintao Li. 2014. “SOML: Sparse Online Metric Learning With Application to Image Retrieval”. Proceedings of the AAAI Conference on Artificial Intelligence 28 (1). https://doi.org/10.1609/aaai.v28i1.8911.