Existence result for nonlinear pantograph fractional differential equations involving generalized Caputo derivative. Gulf Journal of Mathematics, [S. l.], v. 19, n. 2, p. 424–441, 2025. DOI: 10.56947/gjom.v19i2.2574. Disponível em: https://www.gjom.org/index.php/gjom/article/view/2574. Acesso em: 5 oct. 2026.