1. Is hormonal therapy still justified in imminent abortion?;Berle;Zeitschrift fur Geburtshilfe und Perinatologie,1980
2. A randomised trial of progesterone prophylaxis after midtrimester amniocentesis;Corrado;European Journal of Obstetrics & Gynaecology and Reproductive Biology,2002
3. Double-blind controlled trial of progesterone substitution in threatened abortion;Gerhard;Biological Research in Pregnancy and Perinatology,1987
4. Double-blind trial of a progestin in habitual abortion;Goldzieher;Journal of the American Medical Association,1964
5. Hormones in recurrent abortion;Klopper;Journal of Obstetrics and Gynaecology of the British Commonwealth,1965