ОБОРИН, М. С. The natural-resource and ecological situation of the territory as a The basis for sustainable development of the sanatorium services market. HERALD OF TVER STATE UNIVERSITY. SERIES: GEOGRAPHY AND GEOECOLOGY, [S. l.], n. 2, 2018. Disponível em: https://journal.tversu.ru/index.php/geo/article/view/39. Acesso em: 13 nov. 2024.