Zheng, Yu, Bowei Chen, Timothy M. Hospedales, and Yongxin Yang. 2020. “Index Tracking With Cardinality Constraints: A Stochastic Neural Networks Approach”. Proceedings of the AAAI Conference on Artificial Intelligence 34 (01):1242-49. https://doi.org/10.1609/aaai.v34i01.5478.