, A. B. P. P. P. . Some Chain?Type Estimators for Population Variance in Two Phase Sampling. International Journal on Recent and Innovation Trends in Computing and Communication, [S. l.], v. 5, n. 5, p. 879–885, 2017. DOI: 10.17762/ijritcc.v5i5.624. Disponível em: https://ijritcc.org/index.php/ijritcc/article/view/624. Acesso em: 17 jul. 2024.