D.I. Borisov, D.M. Polyakov, “Uniform Spectral Asymptotics for a Schrödinger Operator on a Segment with Delta-Interaction”, Russ. J. Math. Phys., 31:2 (2024), 149
Nurlan IMANBAEV, “Distribution of eigenvalues of a perturbed differentiation operator on the interval”, Maltepe Journal of Mathematics, 5:2 (2023), 24
Х. К. Ишкин, Р. И. Марванов, “Письмо в редакцию”, Уфимск. матем. журн., 14:4 (2022), 154–154 ; Kh. K. Ishkin, R. I. Marvanov, “Erratum”, Ufa Math. J., 14:4 (2022), 150–150
N. S. Imanbaev, “On nonlocal perturbation of the problem on eigenvalues of differentiation operator on a segment”, Вестн. Удмуртск. ун-та. Матем. Мех. Компьют. науки, 31:2 (2021), 186–193