Крячок, О. С., and Блищик A. I. “Representation of Learning Space Ontology With the Semantic Web Technologies”. Problems of Informatization and Control 1, no. 33 (October 27, 2011): 82–85. Accessed June 14, 2026. http://jrnl.kai.edu.ua/index.php/PIU/article/view/9174.