SUKHOROLSKYI, M. A. Boundary-value problems for the Helmholts equation in domains of the complex plane. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 68, n. 3, p. 363–376, 2016. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1844. Acesso em: 5 dec. 2025.