Maximal exercise at extreme altitudes on Mount Everest - West, J B; Boyer, S J; Graber, D J; Hackett, P H; Maret, K H; Milledge, J S; Peters, R M, Jr; Pizzo, C J; Samaja, M; Sarnquist, F H; Schoene, R B; Winslow, R M (J Appl Physiol, 1983)