BELOPOLSKAYA, Ya. I.; BOITSEV, A. A.; FASSARI, S.; POPOV, I. Y.; RINALDI, F. Two-dimensional Helmholtz resonator with two close point-like windows: regularization for the Neumann case. Methods of Functional Analysis and Topology, [S. l.], v. 28, n. 2, p. 95–104, 2022. DOI: https://doi.org/10.31392/MFAT-npu26_2.2022.01. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/822. Acesso em: 15 dec. 2025.