Küpper T, Heussen N, Morrison A, Schöffl V, Basnyat B, Hillebrandt D, Milledge J, Steffgen J, Meier B. The Borg Scale at high altitude. Health Prom Phys Act [Internet]. 2021 Jun. 18 [cited 2024 May 21];15(2):1-8. Available from: https://www.journals.anstar.edu.pl/index.php/hppa/article/view/20