1. Adlerkreutz, H., Eisalo, A., Heino, A., Luukainen, T., Pentilä, I., Saukkonen, H.: Investigations on the effect of an oral contraceptive and its components on liver function, serum proteins, copper, coeruloplasmin and gamma-glutamyl-peptidase in postmenopausal woman. Scand. J. Gastroent.18, 273 (1968).
2. Aurell, M., Cramer, K., Rybo, G.: Serum lipids and lipoproteins during long-term administration of an oral contraceptive. Lancet1966 I, 293.
3. Bockner, V., Roman, W.: The influence of ural contraceptives on the binding capacity of serum proteins. Med. J. Aust.2, 1187 (1967).
4. Borglin, N.E., Nyman, M.: Effect of estrogens on the haptoglobin level in the blood. Scand. J. clin. Lab. Invest.13, 107 (1961).
5. Bottermann, P., Dieterle, P., Hochheuser, W., Horn, K., Kopetz, K., Schleypen, K., Schwarz, K., Scriba, P.C.: Zur Frage der endokrinen Nebenwirkungen der Ovulationshemmer. Münch. med. Wschr.13, 685 (1967).