@book{6650,
	author = {WHO Division of Communicable Diseases Ad Hoc Committee on Orthopoxvirus Infections Meeting (1990 : Geneva).},
	title = {Report of the Ad Hoc Committee on Orthopoxvirus Infections, Geneva, 11-13 December 1990.},
	publisher = {World Health Organization,},
	year = {1991.},
	address = {Geneva : }
}