TY  - RPRT
TI  - A method to obtain a randomized control group where it seems impossible. A case study in program evaluation.
AU  - S H Zhu
PY  - 1999
DO  - 10.1177/0193841x9902300401
UR  - https://pubmed.ncbi.nlm.nih.gov/10558391/
ID  - 10558391
ER  -