Acikgoz M, Araci S, Şen E. Spectral problem for Sturm – Liouville operator with retarded argument which contains a spectral parameter in boundary condition. Ukr. Mat. Zhurn. [Internet]. 2016Aug.25 [cited 2024Dec.4];68(8):1102-14. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/1905