NIKOLAEV, K. D. ENVIRONMENTALLY SOUND TOURISTIC POTENTIAL OF REGIONS OF UKRAINE. Proceedings of National Aviation University (archive), [S. l.], v. 35, n. 2, p. 85–89, 2008. DOI: 10.18372/2306-1472.35.1573. Disponível em: http://jrnl.kai.edu.ua/index.php/visnik/article/view/1573. Acesso em: 18 apr. 2026.