BÄCKLUND L. and TAMMIVAARA-HILTY R. 1972. Gas Exchange in Two Male Age Groups in Relation to Inspiratory Oxygen Fraction, Physical Exercise and Body Posture. Upsala Journal of Medical Sciences. 77, 2 (Jun. 1972), 95-111. DOI:https://doi.org/10.1517/03009734000000015.