R. W. Beard, Elizabeth M. Belsey, Shirley Lal, Stella C. Lewis, H. S. Greer
Beard R W, Belsey E M, Lal S, Lewis S C, Greer H S.
King's Termination Study II: Contraceptive Practice before and after Outpatient Termination of Pregnancy
Br Med J 1974; 1 :418
doi:10.1136/bmj.1.5905.418