Ziryanov AI, Korolev AY, Mishlavtceva SE, Safarian AA. Approaches to active tourism in the Urals and in Perm Krai. Tour [Internet]. 2016 Jun. 30 [cited 2024 Jun. 17];26(1):79-84. Available from: https://www.czasopisma.uni.lodz.pl/tourism/article/view/5337