1. Hurtado, A., in Handbook of Physiology (edit. by Dill, D. B., Adolf. E. F., and Wilber, C. G.), Section 4 (Amer. Physiol. Soc., Washington, 1964).
2. Keys, A., Hall, F. G., and Guzman Barron, E. S., Amer. J. Physiol., 115, 292 (1936).
3. Aste-Salazar, H., and Hurtado, A., Amer. J. Physiol., 142, 733 (1944).
4. Hurtado, A., Velasquez, T., Reynafarje, C., Lozano, R., Chavez, R., Chavez, R., and Munoz, J., Rep. US School Aviation Med. USAF Randolf Air Force Base, Texas, No. 56–1 (1956).
5. Lenfant, C., Torrance, J., English, E., Finch, C. A., Peynafarje, C., Ramos, J., and Faura, J., J. Clin. Invest., 47, 12 (1968).