REFERENCES
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- Kasprzyk , D. , Duncan , G. , Kalton , G. and Singh , M. 1989 . Panel Surveys , New York : Wiley Interscience .
- Ziegel , E. 1990 . Review of Panel Surveys . Technometrics , 32 : 466 – 467 . by D. Kasprzyk, G. Duncan, G. Kalton, and M. Singh