Särndal, C. E., Swensson, B., & Wretman, J. (1992). Model Assisted Survey Sampling. New York: Springer-Verlag.
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Lee, E. S., Forthofer, R. N., & Lorimor, R. J. (1989). Analyzing Complex Survey Data. Sage University Papers 71: Quantitative Applications in the Social Sciences. Särndal, C. E., Swensson, B., & Wretman, J. (1992). Model Assisted Survey Sampling. New York: Springer-Verlag.
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