MEL'NIK, T. A. Asymptotic behavior of eigenvalues and eigenfunctions of the Fourier problem in a thick multilevel junction. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 58, n. 2, p. 195–216, 2006. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3447. Acesso em: 5 dec. 2025.