TY  - BOOK
AU  - lehtonen, Risto.
TI  - Practical Methods for Design and Analysis of Complex Surveys / 
SN  - 0471 93934 X
U1  - B2817 
PY  - 1996///
CY  - New York : 
PB  - John wiley & Sons, Inc , 
KW  - Sampling Techniques
ER  -