TY  - BOOK
AU  - Rosenbaum, Paul R
TI  - Observational studies
T2  - Springer series in statistics
SN  - 0-387-94482-6
U1  - 001.42/ROS 
PY  - 1995///
CY  - Berlin
PB  - Springer Verlag
KW  - Analysis of variance
KW  - Experimental design
ER  -