1. Phase contrast microscopic observation of the human placenta from six weeks to term;Aladjem;Obstet. Gynec.,1968
2. Morphology and physiopathology of the human placenta;Alvarez;Obstet. Gynec.,1964
3. Ethische Probleme am Beginn des Lebens;Beller,1981
4. Prenatal diagnosis in the first trimester using chorionic villi;Blakemore,1983
5. The psychologic sequelae of abortion performed for a genetic indication;Blumberg;Amer. J. Obstet. Gynec.,1975