1. Rudolf Bayer. 1997. The Universal B-Tree for Multidimensional Indexing: General Concepts. In Worldwide Computing and Its Applications Takashi Masuda Yoshifumi Masunaga and Michiharu Tsukamoto (Eds.). Springer Berlin Heidelberg 198--209.
2. Nigel Bayliss. 2014. Optimizing Table Scans with Zone Maps. https://blogs.oracle.com/datawarehousing/post/optimizing-table-scans-with-zone-maps.
3. Zach Christopherson. 2016. Amazon Redshift Engineering's Advanced Table Design Playbook: Compound and Interleaved Sort Keys. https://aws.amazon.com/blogs/big-data/amazon-redshift-engineerings-advanced-table-design-playbook-compound-and-interleaved-sort-keys/.
4. Jialin Ding, Vikram Nathan, Mohammad Alizadeh, and Tim Kraska. 2020. Tsunami: A Learned Multi-dimensional Index for Correlated Data and Skewed Workloads. CoRR abs/2006.13282 (2020). arXiv:2006.13282 https://arxiv.org/abs/2006.13282
5. Fractals for secondary key retrieval