АКСЬОНОВ, О. The ecological balance of the environment. Proceedings of National Aviation University (archive), [S. l.], v. 33, n. 3-4, p. 138–141, 2007. DOI: 10.18372/2306-1472.33.1513. Disponível em: http://jrnl.kai.edu.ua/index.php/visnik/article/view/1513. Acesso em: 17 apr. 2026.