Oh, Shunhao, and Hon Wai Leong. 2021. “Edge N-Level Sparse Visibility Graphs: Fast Optimal Any-Angle Pathfinding Using Hierarchical Taut Paths”. Proceedings of the International Symposium on Combinatorial Search 8 (1):64-72. https://doi.org/10.1609/socs.v8i1.18427.