TAMMIVAARA-HILTY , R. 1973. Gas Exchange in Severe Chronic Obstructive Lung Disease in Relation to Inspired Oxygen and Increased Carbon Dioxide Fraction, Physical Exercise and Body Posture. Upsala Journal of Medical Sciences. 78, 2 (Jun. 1973), 98-115. DOI:https://doi.org/10.3109/03009737309178615.