An improved efficient class of estimators for the population variance. - Iqra Niaz; Aamir Sanaullah; Iram Saleem; Javid Shabbir (Concurr. Comput. Pract. Exp., 2022)

A class of hybrid type estimators for variance of a finite population in simple random sampling. - Aamir Sanaullah; Iqra Niaz; Javid Shabbir; Iqra Ehsan (Commun. Stat. Simul. Comput., 2022)