TY  - RPRT
TI  - Approximate variance formulas for standardized rate ratios.
AU  - W D Flanders
PY  - 1984
DO  - 10.1016/0021-9681(84)90028-6
UR  - https://pubmed.ncbi.nlm.nih.gov/6725499/
ID  - 6725499
ER  -