TY  - RPRT
TI  - A better system for polio vaccination in developing countries?
AU  - W Ehrengut
PY  - 1980
DO  - 10.1136/bmj.281.6246.1004-a
UR  - https://pubmed.ncbi.nlm.nih.gov/7427524/
ID  - 7427524
ER  -