Afonina, Marina, Elena Shcherbina, and Alevtina Balakina. “The New Generation of Winter Recreational and Sports Facilities on Artificial Relief in Cities”. International Journal of Engineering & Technology 7, no. 2.13 (April 15, 2018): 210–219. Accessed April 27, 2024. https://www.sciencepubco.com/index.php/ijet/article/view/11689.