Arai, Hiromasa, Crystal Maung, and Haim Schweitzer. “Optimal Column Subset Selection by A-Star Search”. Proceedings of the AAAI Conference on Artificial Intelligence 29, no. 1 (February 16, 2015). Accessed August 19, 2022. https://ojs.aaai.org/index.php/AAAI/article/view/9353.