Булашев Олександр Якович (Alexander B. The Cartographic providing of recreations and tourist activity. Slobozhanskyi Herald of Science and Sport, [S. l.], n. 6(44), p. 19–23, 2014. DOI: 10.15391/snsv.2014-6.004. Disponível em: https://journals.uran.ua/index.php/1991-0177/article/view/35167. Acesso em: 23 nov. 2024.