1. Achenbach, W., u.W.Ernst: Beitrag zur Problematik des Klinefelter Syndroms. Klin. Wschr. 1957, 380.
2. Albert, A., L. O. Underdahl, L.F.Greene and N.Lorenz: Male hypogonadism. II. Classification. Proc. Staff Meet. Mayo Clin. 28, 557 (1953).
3. Albert, A., L. O. Underdahl, L.F.Greene and N.Lorenz: Male hypogonadism. III. The testis in pituitary dwarfism. Proc. Staff Meet. Mayo Clin. 28, 698 (1953).
4. Albert, A., L. O. Underdahl, L.F.Greene: Male hypogonadism. IV. The testis in prepubertal or pubertal failure. Proc. Staff Meet. Mayo Clin. 29, 131 (1954).
5. Albert, A., L. O. Underdahl, L.F.Greene: Male hypogonadism. VII. The testis in partial gonadotrophic failure during puberty (lack of luteinizing hormone only). Proc. Staff Meet. Mayo Clin. 30, 31 (1955).