A two-stage procedure for estimation of the common mean of several normal populations having unequal and unknown variances. - Rahul Gupta; Sandeep Bhougal; J. P. Singh Joorel (Model. Assist. Stat. Appl., 2006)

A general class of estimators in stratified random sampling. - Kuldeep Kumar Tiwari; Sandeep Bhougal; Sunil Kumar (Commun. Stat. Simul. Comput., 2023)