Freitag, Livia, et al. “The Physiological and Perceptual Stress Response During Data Collection in Altitude: A Single-Case Report of A Healthy Researcher”. Archives of Clinical and Medical Case Reports, vol. 5, no. 6, Nov. 2021, pp. 821-3, https://fortunejournals.org/ojs/index.php/acmcr/article/view/22556.