Sapagovas M, Pupalaigė K, Čiupaila R, Meškauskas T. On the spectrum structure for one difference eigenvalue problem with nonlocal boundary conditions. MMA [Internet]. 2023Sep.4 [cited 2024Nov.18];28(3):522–541. Available from: https://jeelm.vgtu.lt/index.php/MMA/article/view/17503