ZREIK, Mahdi. On the approximation of the δ-shell interaction for the 3-D Dirac operator. CUBO, A Mathematical Journal, [S. l.], v. 26, n. 3, p. 489–505, 2024. DOI: 10.56754/0719-0646.2603.489. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/3880. Acesso em: 2 nov. 2025.