PALAMUT KOSAR, N.; AKCAY, O. The spectrum and principal functions of a nonself-adjoint Sturm–Liouville operator with discontinuity conditions. Eurasian Mathematical Journal, [S. l.], v. 15, n. 3, p. 55–67, 2024. Disponível em: https://emj.enu.kz/index.php/main/article/view/416. Acesso em: 19 nov. 2024.