1. Observations on the vital capacity during the last month of pregnancy and the puerperium;Alward, H.C.;American Journal of Obstetrics and Gynecology,1930
2. Airway closure as a function of age;Anthonisen, N.R.; Danson, J.J.; Robertson, P.C.; Ross, W.;Respiration Physiology,1969
3. Lungenventilation und Atmung in der Schwangerschaft;Anthony, A.J.; Hansen, R.;Zeitschrift fiir Geburtshilfe und Gyndkologie,1934
4. Closing volume and pregnancy;Bevan, D.R.; Holdcroft, A.; Loh, L.; MacGregor, W.G.; O'Sullivan, J.C.; Sykes, M.K.;British Medical Journal,1974
5. Principles and Practice of Obstetric Analgesia and Anesthesia;Bonica, J.J.,1967