ONYEKA. Estimation of Population Ratio in Simple Random Sampling using Variable Transformation. Global Journal of Science Frontier Research, [S. l.], v. 13, n. F4, p. 57–65, 2013. Disponível em: https://journalofscience.org/index.php/GJSFR/article/view/856. Acesso em: 3 may. 2024.