TY  - JOUR
A1  - Holland, P.W.
A1  - Rubin, D.B.
T1  - Causal inference in retrospective studies
Y1  - 1988
DO  - 10.1177/0193841X8801200301
JF  - Evaluation Review
VL  - 12
IS  - 3
SP  - 203
EP  - -231

ER  -