Ulam stability analysis of stochastic pantograph integro-differential equation with Hilfer fractional derivative. Nonlinear Studies, [S. l.], v. 32, n. 4, p. 1425–1443, 2025. Disponível em: https://nonlinearstudies.com/index.php/nonlinear/article/view/3791. Acesso em: 3 feb. 2026.