Existence, uniqueness, Ulam stability and continuous dependence of mild nonnegative solutions for an iterative fractional relaxation differential equation. Nonlinear Studies, [S. l.], v. 33, n. 1, p. 21`9–234, 2026. Disponível em: https://nonlinearstudies.com/index.php/nonlinear/article/view/4152. Acesso em: 28 feb. 2026.