КРЯЧОК, О. С.; Євтушенко B. O. About development a formal model of ontology for semantic search systems. Problems of Informatization and Control, [S. l.], v. 1, n. 33, p. 86–89, 2011. DOI: 10.18372/2073-4751.1.9178. Disponível em: http://jrnl.kai.edu.ua/index.php/PIU/article/view/9178. Acesso em: 14 jun. 2026.