AHTAMOVA M.E. FACTORS INCREASING THE EFFICIENCY OF ENVIRONMENTAL TOURISM SERVICES IN SAMARKAND REGION. World Economics and Finance Bulletin, [S. l.], v. 3, p. 12-15, 2021. Disponível em: https://scholarexpress.net/index.php/wefb/article/view/163. Acesso em: 14 may. 2025.