1. Classroom Note: The Lagrange--Charpit Method
2. A.N. Tikhonov, A.A. Samarskiy, "Equations of Mathematical Physics", Nauka, Moscow (1977).
3. M.I. Imanaliev, "Nonlinear integro-differential partial differential equations", Ilim, Bishkek (1992).
4. P.S. Pankov, O.D. Budnikova, Numerical solution of the Riemann wave motion problem based on the additional argument method, Research on integro-differential equations, Ilim, Bishkek, 32, 35–38 (2003).
5. M.I. Imanaliev, T.M. Imanaliev, Soliton solutions of the nonlinear regularizated Korteweg-de Vries partial differential equations, First Turkish world mathematics symposium, Elazig, Turkiye, 140–141 (1999).