The Costly Journals Index: An Importance for Future Research. International Journal of Inventive Engineering and Sciences (IJIES), [S. l.], v. 12, n. 11, p. 32–36, 2025. DOI: 10.35940/ijies.K1131.12111125. Disponível em: https://journals.blueeyesintelligence.org/index.php/ijies/article/view/938.. Acesso em: 7 dec. 2025.