Küpper, Thomas, N. Heussen, Audry Morrison, Volker Schöffl, Buddha Basnyat, David Hillebrandt, Jim Milledge, Jürgen Steffgen, and Beate Meier. “The Borg Scale at High Altitude”. Health Promotion & Physical Activity 15, no. 2 (June 18, 2021): 1–8. Accessed May 21, 2024. https://www.journals.anstar.edu.pl/index.php/hppa/article/view/20.