@article {kp67,
	title = {Minimal infective dose of attenuated poliovirus for man},
	journal = {American Journal of Public Health and the Nations Health},
	volume = {57},
	year = {1967},
	pages = {10},
	author = {Katz, M. and Plotkin, S. A.}
}
@article {pci65,
	title = {Studies of immunization with living rubella virus. Trials in children with a strain cultured from an aborted fetus},
	journal = {American journal of diseases of children (},
	volume = {110},
	year = {1965},
	pages = {4},
	author = {Plotkin, S. A. and Cornfeld, D. and Ingalls, T. H.}
}
