DouglasCG, HaldaneJS, HendersonY, SchneiderEC. Physiological observations made on Pike's Peak, Colorado, with special reference to adaptation to low barometric pressures. Philos T R Soc Lon B, 203:185–318. 1913.
2.
FitzGeraldMP. The changes in the breathing and the blood at various altitudes. Philos T R Soc Lon B, 203:351–371. 1913.