VALIYEV, A.A.; VALIYEV, M.B.; HUSEYNOV, E.H. Spectrum and resolvent of multi-channel systems with internal energies and common boundary conditions. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 115, n. 3, p. 150–157, 2024. DOI: 10.31489/2024m3/150-157. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/823. Acesso em: 2 jul. 2025.