A. R. Bikmetov, I. Kh. Khusnullin, “Perturbation of Hill operator by narrow potentials”, Izv. Vyssh. Uchebn. Zaved. Mat., 2017, no. 7, 3–13; Russian Math. (Iz. VUZ), 61:7 (2017), 1–10
2.
I. Kh. Khusnullin, “Perturbation of a waveguide by a narrow potential”, Trudy Inst. Mat. i Mekh. UrO RAN, 23:2 (2017), 274–284
2015
3.
A. R. Bikmetov, V. F. Vil'danova, I. Kh. Khusnullin, “On perturbation of a Schrödinger operator on axis by narrow potentials”, Ufimsk. Mat. Zh., 7:4 (2015), 25–33; Ufa Math. J., 7:4 (2015), 24–31
R. R. Gadyl'shin, I. Kh. Khusnullin, “Perturbation of a periodic operator by a narrow potential”, TMF, 173:1 (2012), 127–134; Theoret. and Math. Phys., 173:1 (2012), 1438–1444
R. R. Gadyl'shin, I. Kh. Khusnullin, “Schrödinger operator on the axis with potentials depending on two parameters”, Algebra i Analiz, 22:6 (2010), 50–66; St. Petersburg Math. J., 22:6 (2011), 883–894
I. Kh. Khusnullin, “A perturbed boundary eigenvalue problem for the Schrödinger operator on an interval”, Zh. Vychisl. Mat. Mat. Fiz., 50:4 (2010), 679–698; Comput. Math. Math. Phys., 50:4 (2010), 646–664