MIL'MAN, A. L. Scattering matrix for the wave equation with finite radial potential in the two-dimensional space. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 45, n. 6, p. 791–802, 1993. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5868. Acesso em: 5 dec. 2025.