TY  - BOOK
AU  - Rosenbaum,Paul R.
TI  - Observational studies
T2  - Springer series in statistics
SN  - 0387944826 :
U1  - 519.57 23
PY  - 1995///
CY  - New York
PB  - Springer-Verlag
KW  - Design of experiments
N1  - Includes bibliography and index
ER  -