F. T. Perkins, Risha Yetts, Wilfrid Gaisford
Perkins F T, Yetts R, Gaisford W.
A Comparison of the Responses of 100 Infants to Primary Poliomyelitis Immunization with Two and with Three Doses of Vaccine
Br Med J 1959; 1 :1083
doi:10.1136/bmj.1.5129.1083