@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.} }