1. Albert, A., Underdahl, L. O., Greene, L. F., Lorenz, N.: Male hypogonadism: I. The normal testis. Mayo Clin. Proc. 28, 409–422 (1953).
2. Arthaud, G.: Ètude sur le testicule sénile. Thèse (Paris) 303, 2–24 (1885).
3. Arzac, J. P.: Glycogen in human testicular biopsy material. J. clin. Endocr. 10, 1465–1470 (1950).
4. Axelrod, L. R.: Metabolic patterns of steroid biosynthesis in young and aged human testes. Biochim. biophysica Acta (N.Y.) 97, 551–556 (1965).
5. Azzali, G.: Ricerche anatomo-radiografiche sulla senescenza delle vene del testicolo dell’uomo. Biol. lat. (Milano) 11, 643–661 (1958).