MellemgaardK: The alveolar-arterial oxygen difference, its size and components in normal man. Acta Physiol Scand67: 10, 1966.
2.
BeginR, RenzettiADJr: Alveolar-arterial oxygen pressure gradient: I. Comparison between an assumed and actual respiratory quotient in stable chronic pulmonary disease; II. Relationship to aging and closing volume in normal subjects. Respir Care22: 491, 1977.
