1. Bidlingmaier, F., Knorr, D.: Plasmaestrogens in childhood and adolescence. Acta paediat. scand. 62, 86 (1973)
2. Bidlingmaier, F., Wagner-Barnack, M., Butenandt, O., Knorr, D.: Plasma estrogens in childhood and puberty under physiological and pathological conditions. Pediat. Res. (in print)
3. Collett-Solberg, P. R., Grumbach, M. M.: A simplified procedure for evaluating estrogenic effects and the sex chromatin pattern in exfoliated cells in urine: Studies in premature thelarche and gynecomastia of adolescence. J. Pediat. 66, 883 (1965)
4. Daniel, W. A., Jr.: Gynecomastia. In: Gellis, S. S., Kagan, B. M.: Current Pediatric Therapy, Bd. 5, S. 327. Philadelphia-London-Toronto: Saunders 1971
5. Danowski, T. S.: True gynecomastia. In: Clinical endocrinology I, 465. Baltimore: The Williams and Wilkins Comp. 1962