4Brian L;Sheppard.The effect of intrauterine contraceptive devices on the ultrastructure of the endometrium in relation to bleeding complications,1983.
5Casslen B.Occumence of both urokinase and tissue plasminogen activator in the human endometrium[J],1983.
6Robison Alicek.Activation of the fibrinolytic System,1987.
