М. В. Нещадим, “Обобщенные функционально-инвариантные решения волнового уравнения в размерности 2”, Сиб. журн. чист. и прикл. матем., 17:3 (2017), 58–66 ; M. V. Neshchadim, “Generalized functional invariant solutions of wave equation for dimension 2”, J. Math. Sci., 237:4 (2019), 569–575
Fedorchuk V., Fedorchuk V., “On Classification of Symmetry Reductions for the Eikonal Equation”, Symmetry-Basel, 8:6 (2016), 51
А. В. Боровских, “Уравнение эйконала для анизотропной среды”, Тр. сем. им. И. Г. Петровского, 29, Изд-во Моск. ун-та, М., 2013, 162–229 ; A. V. Borovskikh, “Eikonal equation for anisotropic media”, J. Math. Sci. (N. Y.), 197:2 (2014), 248–289
Alexander Bihlo, Elsa Dos Santos Cardoso-Bihlo, Roman O. Popovych, “Complete group classification of a class of nonlinear wave equations”, J. Math. Phys, 53:12 (2012), 123515
Vaneeva O.O., Popovych R.O., Sophocleous C., “Extended Group Analysis of Variable Coefficient Reaction-Diffusion Equations with Exponential Nonlinearities”, J. Math. Anal. Appl., 396:1 (2012), 225–242
Popovych R.O., Kunzinger M., Eshraghi H, “Admissible Transformations and Normalized Classes of Nonlinear Schrodinger Equations”, Acta Applicandae Mathematicae, 109:2 (2010), 315–359
N. M. Ivanova, R. O. Popovych, C. Sophocleous, “Group analysis of variable coefficient diffusion-convection equations. I. Enhanced group classification”, Lobachevskii J Math, 31:2 (2010), 100
А. В. Боровских, “Уравнения Эйконала для неоднородной и анизотропной среды”, Совр. матем. и ее приложения, 64 (2009), 18–38 ; A. V. Borovskikh, “Eikonal equations for an inhomogeneous anisotropic medium”, Journal of Mathematical Sciences, 164:6 (2010), 859–880
Vaneeva O.O., Johnpillai A.G., Popovych R.O., Sophocleous C., “Enhanced group analysis and conservation laws of variable coefficient reaction-diffusion equations with power nonlinearities”, J. Math. Anal. Appl., 330:2 (2007), 1363–1386
А. В. Боровских, “Двумерное уравнение эйконала”, Сиб. матем. журн., 47:5 (2006), 993–1018 ; A. V. Borovskikh, “The two-dimensional eikonal equation”, Siberian Math. J., 47:5 (2006), 813–834