OKEH UM. Simultaneous Estimation of Adjusted Rate of Two Factors using Method of Direct Standardization. Global Journal of Science Frontier Research, [S. l.], v. 15, n. F7, p. 37–42, 2015. Disponível em: https://journalofscience.org/index.php/GJSFR/article/view/1648. Acesso em: 24 apr. 2024.