Sextant: Grab's Scalable In-Memory Spatial Data Store for Real-Time K-Nearest Neighbour Search. - Zhiyin Zhang; Xiaocheng Huang; Chaotang Sun; Shaolin Zheng; Bo Hu; Jagannadan Varadarajan; Yifang Yin; Roger Zimmermann; Guanfeng Wang (MDM, 2019)