HASAN, Shatha; SAKKIJHA, Mona. Toward strictly singular fractional operator restricted by Fredholm-Volterra in Sobolev space. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 43, p. 416–427, 2020. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/7330. Acesso em: 6 nov. 2026.