TY  - RPRT
TI  - Follow-up study: protective immunization in the elderly.
AU  - F L Ruben
AU  - P Fireman
PY  - 1983
DO  - 10.2105/ajph.73.11.1330
UR  - https://pubmed.ncbi.nlm.nih.gov/6625045/
ID  - 6625045
ER  -