IVANOVA, Svetlana. Legal Problems Concerning Implementation of Sustainable Ecotourism in Russia. Problemy Ekorozwoju / Problems of Sustainable Development, [S. l.], v. 16, n. 2, p. 209–216, 2021. DOI: 10.35784/pe.2021.2.22. Disponível em: https://ph.pollub.pl/index.php/preko/article/view/5185. Acesso em: 10 jan. 2026.