TY  - RPRT
TI  - Sabin, Salk, or sequential?
AU  - H F Hull
AU  - J W Lee
PY  - 1996
DO  - 10.1016/s0140-6736(96)91194-0
UR  - https://pubmed.ncbi.nlm.nih.gov/8596370/
ID  - 8596370
ER  -