1. Adichwal, N.K., Sharma, P., Verma, H.K., Singh, R.: Generalized class of estimators for estimating population variances using auxiliary attribute. Int. J. Appl. Comput. Math. 1(3), 1–10 (2015)
2. Adichwal, N.K., Sharma, P., Singh, R.: Estimation of finite population variances using auxiliary attribute in sample surveys. J. Adv. Comput. 4(2), 88–100 (2015b)
3. Ahmed, M.S., Raman, M.S., Hossain, M.I.: Some competitive estimators of finite population variance multivariate auxiliary information. Inf. Manag. Sci. 11(1), 49–54 (2000)
4. Asghar, A., Sanaullah, A., Hanif, M.: Generalized exponential-type estimator for population variance in survey sampling. Rev. Colomb. Estad. 37(1), 211–222 (2014)
5. Gupta, S., Shabbir, J.: Variance estimation in simple random sampling using auxiliary information. Hacet. J. Math. Stat. 37, 57–67 (2008)