TY  - DATA
AU  - Ramakrishnan M K
TI  - Optimum estimation and strategies in survey sampling
U1  - 000SA.5 
CY  - 1970
KW  - Sampling survey
UR  - http://192.168.143.32:8080/jspui/bitstream/10263/4177/1/TH11.CV01.pdf
ER  -