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Singh, H.P., Rathour, A. and Solanki, R.S. 2013. Improved class of estimators of finite population mean using sampling fraction and information on two auxiliary variables in sample surveys. Statistica. 73, 3 (Jan. 2013), 353–361. DOI:https://doi.org/10.6092/issn.1973-2201/4329.