New alternatives to ratio estimators of population variance in sample surveys. - Hilal A. Lone; Rajesh Tailor; Housila P. Singh; Med Ram Verma (Appl. Math. Comput., 2014)

Improved ratio-cum-product type exponential estimators for ratio of two population means in sample surveys. - Rajesh Tailor; Hilal A. Lone (Model. Assist. Stat. Appl., 2014)