TY  - BOOK
AU  - Sarndal, Carl-Erik
AU  - Bengt Swensson
AU  - Jan Wretman
TI  - Model assisted survey sampling 
T2  - (Springer series in statistics)
PY  - 1991///
CY  - New York 
PB  - Springer - Verlag
KW  - Sampling (statistics)
ER  -