@book{7265,
	author = {World Health Organization.},
	title = {Active immunization against common communicable diseases of childhood : report of a group of consultants convened by the Director-General, Geneva, 25-28 May 1949.},
	publisher = {World Health Organization,},
	year = {1950.},
	series = {(WHO technical report series ; 6).},
	address = {Geneva : }
}