SINGH, H. P. .; NIGAM, P. . A Generalized Class of Estimators for Finite Population Mean Using Two Auxiliary Variables in Sample Surveys. Journal of Reliability and Statistical Studies, [S. l.], v. 15, n. 01, p. 61–104, 2022. DOI: 10.13052/jrss0974-8024.1514. Disponível em: https://journals.riverpublishers.com/index.php/JRSS/article/view/20305. Acesso em: 3 jun. 2026.