TY  - RPRT
TI  - Systematic epidemiologic theory: conceptual foundations and axiomatic elements.
AU  - G M Lower
PY  - 1983
DO  - 10.1016/0306-9877(83)90063-4
UR  - https://pubmed.ncbi.nlm.nih.gov/6888306/
ID  - 6888306
ER  -