[1]      N.A. Kudryashov, D.I. Sinelshchikov. Extended models of non-linear waves in liquid with gas bubbles, International Journal of Non-Linear Mechanics 63 (2014) 31-38.
                                                                                                                [2]      N.A. Kudryashov, D.I. Sinelshchikov. Periodic structures described by the perturbed Burgers-Korteweg-de Vries equation, International Journal of Non-Linear Mechanics 72 (2015) 16-22.
                                                                                                                [3]      G.F. Jefferson, J. Carminati. ASP: Automated symbolic computation of approximate symmetries of differential equations. Computer Physics Communications 184 (2013) 1045-1063.
                                                                                                                [4]      V.A. Baikov, R.K. Gazizov, N.Kh. Ibragimov. Perturbation methods in group analysis. J. Sov. Math 1991;55:1450-90. grade, Acta Mechanica Sinica 24(6), 661-670, 2008.
                                                                                                                [5]      V.A. Baikov, R.K. Gazizov, N.H. Ibragimov. Approximate symmetries of equations with a small parameter. Mat Sb 1988;136:435-50.
                                                                                                                [6]      M. Pakdemirli, M. Yurusoy, T. Dolapc. Comparison of approximate symmetry methods for differential equations. Acta Appl Math 2004;80:243-71.
                                                                                                                [7]      N.H. Ibragimov, Selected works, vol. III, 2008, 317p. ISBN 978-91-7295-992-7.
                                                                                                                [8]      N.H. Ibragimov, V.F. Kovalev. Approximate and Renormgroup Symmetries, Higher Education Press, Beijing and SpringerVerlag GmbH Berlin Heidelberg, 2009.
                                                                                                                [9]      R.K. Gazizov. Lie Algebras of Approximate Symmetries, Nonlinear Mathematical Physics 1996, V.3, N 1-2, 96-101.
                                                                                                                [10]   N.A. Kudryashov, D.I. Sinelshchikov. Special solutions of a high-order equation for waves in a liquid with gas bubbles, Regul. Chaotic Dyn. 19 (2014), 576-585.
                                                                                                                [11]   R. Dastranj, M. Nadjafikhah. Symmetry analysis and conservation laws for description of waves in bubbly liquid, International Journal of Non-Linear Mechanics, 67 (2014) 48-51.