D. A. Tursunov, K. G. Kozhobekov, Bekmurza uulu Ybadylla, “Asymptotics of solutions of boundary value problems for the equation $\varepsilon y''+xp(x)y'-q(x)y=f$”, Eurasian Math. J., 13:3 (2022), 82–91
D. A. Tursunov, Z. M. Sulaimanov, A. A. Khalmatov, “Singularly perturbed ordinary differential equation with turning point and interior layer”, Lobachevskii J. Math., 42:12 (2021), 3016–3021
D. A. Tursunov, Y. B. Uulu, “Asymptotic solution of the Robin problem with a regularly singular point”, Lobachevskii J. Math., 42:3, SI (2021), 613–620
D. A. Tursunov, M. O. Orozov, “Asimptoticheskoe reshenie zadachi Dirikhle dlya koltsa, kogda sootvetstvuyuschee nevozmuschennoe uravnenie imeet regulyarnuyu osobuyu okruzhnost”, Vestn. Tomsk. gos. un-ta. Matem. i mekh., 2020, no. 63, 37–46
K. G. Kozhobekov, U. Z. Erkebaev, D. A. Tursunov, “Asymptotics of the solution to the boundary-value problems when limited equation has singular point”, Lobachevskii J. Math., 41:1, SI (2020), 96–101
A.-D. Lipitakis, “The numerical solution of singularly perturbed nonlinear partial differential equations in three space variables: the adaptive explicit inverse preconditioning approach”, Mod. Simul. Eng., 2019 (2019), 5157145
D. A. Tursunov, K. G. Kozhobekov, “Asymptotic solution of a singularly perturbed Cauchy problem with a turning point”, J. Math. Sci. (N. Y.), 254:6 (2021), 788–792
D. A. Tursunov, K. G. Kozhobekov, “Asimptotika resheniya singulyarno vozmuschennykh differentsialnykh uravnenii s drobnoi tochkoi povorota”, Izvestiya Irkutskogo gosudarstvennogo universiteta. Seriya Matematika, 21 (2017), 108–121