TY  - RPRT
TI  - On testing hypotheses concerning standardized mortality ratios.
AU  - L L Kupper
AU  - D G Kleinbaum
PY  - 1971
DO  - 10.1016/0040-5809(71)90021-9
UR  - https://pubmed.ncbi.nlm.nih.gov/5162690/
ID  - 5162690
ER  -