KERNER, J. On the number of nodal domains on a rectangle with a slit. Methods of Functional Analysis and Topology, [S. l.], v. 27, n. 4, p. 348–352, 2021. DOI: https://doi.org/10.31392/MFAT-npu26_4.2021.08. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/810. Acesso em: 15 dec. 2025.