Sakaue, Shinsaku, and Masakazu Ishihata. “Accelerated Best-First Search With Upper-Bound Computation for Submodular Function Maximization”. Proceedings of the AAAI Conference on Artificial Intelligence 32, no. 1 (April 25, 2018). Accessed March 28, 2024. https://ojs.aaai.org/index.php/AAAI/article/view/11521.