Query5all.com

https://niisar.gitbooks.io/cs/write-sql-query-5.html

https://www.mdpi.com/2227-9032/11/4/528/review_report

https://trepo.tuni.fi/handle/10024/67696

https://www.unrwa.org/sites/default/files/eoi_queries_and_replies-20150624-final.pdf

https://www.princeton.edu/~pmittal/publications/aiql-atc18.pdf

https://link.springer.com/chapter/10.1007/978-981-10-2525-9_22

https://arxiv.org/pdf/2212.10711

https://www.researchgate.net/publication/36191060_The_Effects_Of_Query_Complexity_Expansion_And_Structure_On_Retrieval_Performance_In_Probabilistic_Text_Retrieval

http://oak.cs.ucla.edu/classes/cs143/notes/algebra.pdf

https://www.phonetik.uni-muenchen.de/institut/mitarbeiter/draxler/DraxlThs.pdf