I. Schöffl, J. Wüstenfeld, G. Jones, S. Dittrich, C. Lutter, and V. Schöffl, “Cardiopulmonary exercise tests of adolescent elite sport climbers – a comparison of the German junior national team in sport climbing and Nordic skiing”, Health Prom Phys Act, vol. 14, no. 1, pp. 1–8, Feb. 2021.