TY  - RPRT
TI  - Variance estimators for attributable fraction estimates consistent in both large strata and sparse data.
AU  - S Greenland
PY  - 1987
DO  - 10.1002/sim.4780060607
UR  - https://pubmed.ncbi.nlm.nih.gov/2825320/
ID  - 2825320
ER  -