article 2009 Klassifikation der Endometriose durch Morphologie und Prostaglandin-F-Synthesekapazität ·doi:10.1159/000270569
article 1986 Classification of endometriotic implants by morphologic appearance and capacity to synthesize prostaglandin F Fertility and Sterility ·doi:10.1016/s0015-0282(16)49814-6