Khan, M. Shabbir, J. (2013). Some improved ratio, product, and regression estimators of finite population mean when using minimum and maximum values. The Scientific World Journal. Volume (2013), 7 pages.
Khan, M., Shabbir, J., Hussain, Z., and Al-Zahrani, B. A Class of Estimators for Finite Population Mean in Double Sampling under Non-Response Using Fractional Raw Moments. Journal of Applied Mathematics. Volume (2014), 11Â
Khan, M. Shabbir, J. (2014).  A General Class of Estimators for Finite Population Mean in the Presence of Non-response when using the Second Raw Moments. VFAST Transactions on Mathematics. Volume (2) 19-36.