TY  - RPRT
TI  - Comparison groups in road safety studies: an analysis.
AU  - E Hauer
PY  - 1991
DO  - 10.1016/0001-4575(91)90025-z
UR  - https://pubmed.ncbi.nlm.nih.gov/1772562/
ID  - 1772562
ER  -