1. Arora A, Sinha S, Kumar P, Bhattacharya A (2018) Hd-index: pushing the scalability-accuracy boundary for approximate knn search in high-dimensional spaces. PVLDB 11(8):906–919
2. Beis JS, Lowe DG (1997) Shape indexing using approximate nearest-neighbour search in high-dimensional spaces. In: 1997 conference on computer vision and pattern recognition (CVPR ’97), June 17–19, 1997, San Juan, Puerto Rico, pp 1000–1006. IEEE Computer Society
3. Jon Louis Bentley (1975) Multidimensional binary search trees used for associative searching. Commun ACM 18(9):509–517
4. Ciaccia P, Patella M, and Pavel Zezula. (1997) M-tree An efficient access method for similarity search in metric spaces. In: VLDB’97, Proceedings of 23rd international conference on very large data bases, August 25–29, 1997, Athens, Greece, pp 426–435. Morgan Kaufmann,
5. Ding J, Minhas UF, Yu J, Wang C. ALEX: an updatable adaptive learned index. In: Proceedings of the 2020 international conference on management of data, SIGMOD Conference 2020, online conference [Portland, OR, USA], June 14–19, 2020, pp 969–984. ACM, 2020