CHAUDHARY, M. K. .; KUMAR, A. . An Improvement in Estimation of Population Mean using Two Auxiliary Variables and Two- Phase Sampling Scheme under Non-Response. Journal of Reliability and Statistical Studies, [S. l.], v. 13, n. 02, p. 349–362, 2021. DOI: 10.13052/jrss0974-8024.13247. Disponível em: https://journals.riverpublishers.com/index.php/JRSS/article/view/20559. Acesso em: 14 may. 2026.