1. Bondi, S. Die Entstehung der Herzgeräusche. Ergebn. inn. Med. Kinderhkde, 50, 309, 1936.
2. Braun Menendez, E., y Orias, O. “Estudio fonocardiogrâfico en cien adultos jovenòs.” Rev. argent. de cardiol., 1, 101, 1934.
3. Bridgman, E. W. “Observations on the Third Heart Sound.” Heart, 6, 41, 1914–15.
4. Burrett, J. B., and Schell, D. “The Clinical Importance of Small Intracutaneous Veins in the Human Chest.” Am. J. M. Sc., 201, 399, 1941.
5. Cossio, P., and Fongi, E. G. “Auricular Sound.” Am. Heart J., 11, 723, 1936.