TY  - JOUR
TI  - Reducing Bias in Observational Studies Using Subclassification on the Propensity Score
AU  - Paul R. Rosenbaum
AU  - Donald B. Rubin
JO  - Journal of the American Statistical Association
PY  - 1984
VL  - 79
IS  - 387
DO  - 10.2307/2288398
UR  - https://doi.org/10.2307/2288398
ER  -