N. J. Guliyev, “Inverse square singularities and eigenparameter dependent boundary conditions are two sides of the same coin”, The Quarterly Journal of Mathematics, 74:3 (2023), 889–910 , arXiv: 2001.00061
N. J. Guliyev, “Schrödinger operators with distributional potentials and boundary conditions dependent on the eigenvalue parameter”, J. Math. Phys., 60:6 (2019), 063501 , 23 pp., arXiv: 1806.10459
N. J. Guliyev, “On two-spectra inverse problems”, Proceedings of the American Mathematical Society, 148:10 (2020), 4491–4502 , arXiv: 1803.02567
N. J. Guliyev, “Essentially isospectral transformations and their applications”, Annali di Matematica Pura ed Applicata, 199:4 (2020), 1621–1648 , arXiv: 1708.07497
N. J. Guliyev, “A Riesz basis criterion for Schrödinger operators with boundary conditions dependent on the eigenvalue parameter”, Analysis and Mathematical Physics, 10:1 (2020), 2 , 8 pp., arXiv: 1905.07952