Чижова ВП, Грязин ИВ, Хилько КЮ. Design of ecological trails in natural parks (the "Ergaki" natural park case, West Sayan mountains). Географ. вестн. [Internet]. 2018 Apr. 4 [cited 2025 Apr. 17];(1):138-44. Available from: http://press.psu.ru/index.php/geogr/article/view/1342