DE OLIVEIRA, César R.; VERRI, Alessandra A. Mild singular potentials as effective Laplacians in narrow strips. Mathematica Scandinavica, Berkeley, CA, United States, v. 120, n. 1, p. 145–160, 2017. DOI: 10.7146/math.scand.a-25510. Disponível em: https://journals.msp.org/mscand/article/view/327. Acesso em: 24 jul. 2026.