TY  - RPRT
TI  - Designing research: ex post facto designs.
AU  - M Giuffre
PY  - 1997
DO  - 10.1016/s1089-9472(97)80038-x
UR  - https://pubmed.ncbi.nlm.nih.gov/9214944/
ID  - 9214944
ER  -