A Modified Ideal Rank Index Number Formula. International Journal of Development Mathematics (IJDM), [S. l.], v. 1, n. 2, p. 169–178, 2024. DOI: 10.62054/ijdm/0102.13. Disponível em: https://ijdm.org.ng/index.php/Journals/article/view/53.. Acesso em: 28 aug. 2026.