TY  - RPRT
TI  - Re: "estimability and estimation in case-referent studies".
AU  - M Halperin
AU  - O Miettinen
PY  - 1977
DO  - 10.1093/oxfordjournals.aje.a112409
UR  - https://pubmed.ncbi.nlm.nih.gov/860708/
ID  - 860708
ER  -