TY  - RPRT
TI  - Group theory implications for changing health patterns.
AU  - R F Stewart
AU  - J A Irving
PY  - 1969
DO  - 10.2105/ajph.59.10.1894
UR  - https://pubmed.ncbi.nlm.nih.gov/5388017/
ID  - 5388017
ER  -