@book{9110951,
	author = {Drobyševskaja, A. I. and Ključareva, T. E.},
	title = {Changed virulence for monkeys of attenuated Sabin strains following their prolonged passages through the intestinal tract of susceptible children},
	year = {1960]},
	series = {IVth Scientific conference and International symposium on live vaccine against poliomyelitis},
	address = {[Μ.}
}