@book{7927,
	author = {WHO Scientific Group on Hormonal Steroids in Contraception (1967 : Geneva). and World Health Organization},
	title = {Hormonal steroids in contraception : report of a WHO Scientific Group [meeting held in Geneva from 23-27 October 1967].},
	publisher = {World Health Organization,},
	year = {1968.},
	series = {(WHO technical report series ; 386)},
	address = {Geneva : }
}