BurtscherM, FörsterH, and BurtscherJ. (2008). Superior endurance performance in aging mountain runners. Gerontology, 54:268–271.
2.
BurtscherM, GattererH, and KleinsasserA. (2015). Cardiorespiratory fitness of high altitude mountaineers: The underestimated prerequisite. High Alt Med Biol, 16:169–170.