1. Ambrus, J.L., Niswander, K.R., Courey, N.G., Wamsteker, E.F., Mink, I.B.: Progestational agents and blood coagulation. Amer. J. Obstet. Gynec.103, 994 (1969)
2. Amris, C.J., Starup, J.: The coagulation mechanism in oral contraception. Acta obstet. gynec. scand.46, 78 (1967).
3. Asbeck, F., Bolte, A., Henning, H.D., Hordemann, K., Latz, R., Lechler, E., van de Loo, I.: The mechanism of intravascular activation of the fibrinolytic system during hormonal contraception. Hemostasis1, 108 (1972)
4. Asbeck, F., Lechler, E., van de Loo, I.: Das Verhalten des fibrinolytischen Systems unter Östrogen-Gestagen-Kombinationen. Thrombos. Diathes. haemorrh. Suppl.49, 133 (1973)
5. Bachmann, F., Duckert, F., Koller, F.: The Stuart-Prower Factor assay and its clinical significance. Thrombos. Diathes. haemorrh. (Stuttg.)2, 24 (1958)