1. Achenbach, W., u. W. Ernst: Beitrag zur Problematik des Klinefelter-Syndroms. Klin. Wschr. 35, 380 (1957).
2. Aithen, E.H., and J. R. K. Preedy: The estimation of oestrone, oestradiol-17 β and oestriol in human urine by gradient elution partition chromato-graphy. Biochem. J. 62, 15 (1956).
3. Albert, A.: Human urinary gonadotropin. Recent Progr. Hormone Res. 12, 227 (1956).
4. Albert, A., and J. Derber: Studies on the biologic characterization of human gonadotropins. J. clin. Endocr. 20, 859 (1960).
5. Albert, A., and S. Kelly: Studies on biologic characterization of human gonadotropins. J. clin. Endocr. 18, 1067 (1958a).