1. Abortion surveillance, 1981;Centers for Disease Control,1985
2. Maternal deaths associated with barbiturate anesthesia—New York City;Chavkin;MMWR,1986
3. Occupational epidemiology;Monson,1980
4. Freestanding abortion clinics: services, structure, fees;Henshaw;Fam Plann Perspect,1982
5. Complications of 10,453 consecutive first-trimester abortions: a prospective study;Hodgson;Am J Obstet Gynecol,1974