ДЕНИСЮК, В.; БАБКО, А.; ГУРНІК, О. Systems of basic functions. Proceedings of National Aviation University (archive), [S. l.], v. 34, n. 1, p. 176–180, 2008. DOI: 10.18372/2306-1472.34.1557. Disponível em: http://jrnl.kai.edu.ua/index.php/visnik/article/view/1557. Acesso em: 26 aug. 2026.