Ha, Van Muon, Yulia A. Shichkina, and Sergey V. Kostichev. “ Determining the Composition of Collections for Key-Document Databases Based on a Given Set of Object Properties and Database Querie”. Computer Tools in Education, no. 3 (September 30, 2019): 15-28. Accessed April 25, 2024. http://cte.eltech.ru/ojs/index.php/kio/article/view/1593.