Existence of a solution for integral Urysohn type equations system via fixed points technique in complex valued extended bb-metric spaces. Journal of Prime Research in Mathematics, [S. l.], v. 16, n. 2, p. 109 – 122, 2020. Disponível em: https://jprm.sms.edu.pk/index.php/jprm/article/view/164. Acesso em: 30 aug. 2025.