1. Astrand, Experimental studies of physical working capacity in relation to sex and age (Copenhagen 1952).
2. Astrand, Sport, Alter und Geschlecht. Sportmed. Schriftenreihe Wander (Heft 5, Eigenverlag).
3. Bainbridge, F. A., The Physiology of Muscular Exercise (London-New York-Toronto 1931).
4. Biörck, G., On the relationship between the heart volume and various physical factors. Acta radiol.25, 372 (1944).
5. Bömer, F., Dissertation (Freiburg, in Vorbereitung).