Palamut Kosar N, Akcay O. The spectrum and principal functions of a nonself-adjoint Sturm–Liouville operator with discontinuity conditions. EMJ [Internet]. 2024 Nov. 17 [cited 2024 Nov. 19];15(3):55–67. Available from: https://emj.enu.kz/index.php/main/article/view/416