The Ljubljana abortion study, 1971-1973. [Comparison of the medical effects of induced abortion by two methods, curettage and vacuum aspiration; final report. Principal investigator: F. Novak; coinvestigator: L. Andolæsek. Editor: L. Andolæsek. - Andolsek, L.; Novak, Franc ([Printed by Tiskarna Slovenija; Bethesda, Md., published by the National Institute of Health, Center for Population Research], 1974)