Akiba, Takuya, Takanori Hayashi, Nozomi Nori, Yoichi Iwata, and Yuichi Yoshida. 2015. “Efficient Top-K Shortest-Path Distance Queries on Large Networks by Pruned Landmark Labeling”. Proceedings of the AAAI Conference on Artificial Intelligence 29 (1). https://doi.org/10.1609/aaai.v29i1.9154.