ДЕНИСЮК, В.; БАБКО, А.; ГУРНІК, О. Systems of basic functions. Proceedings of National Aviation University, [S. l.], v. 34, n. 1, p. 176–180, 2008. DOI: 10.18372/2306-1472.34.1557. Disponível em: https://jrnl.nau.edu.ua/index.php/visnik/article/view/1557. Acesso em: 6 may. 2024.