Relative controllability of neutral semilinear$(k,\chi)$-Hilfer fractional integro-differential systemswith nonlocal initial conditions. Nonlinear Studies, [S. l.], v. 33, n. 3, p. 895–908, 2026. Disponível em: https://nonlinearstudies.com/index.php/nonlinear/article/view/4400. Acesso em: 31 aug. 2026.