1. E. A. Zabolotskaya and R. V. Khokhlov, Akust. Zh. 15 (1), 40 (1969) [Sov. Phys. Acoust. 15, 35 (1969)].
2. O. V. Rudenko, Acoust. Phys. 56 (4), 457 (2010).
3. A. D. Polyanin and V. F. Zaitsev, Handbook of Nonlinear Partial Differential Equations, 2nd ed. (Chapman & Hall/CRC Press, Boca Raton, FL, 2012).
4. A. D. Polyanin, V. F. Zaitsev, and A. I. Zhurov, Methods for Solving Nonlinear Equations of Mathematical Physics and Mechanics (Fizmatlit, Moscow, 2005) [in Russian].
5. M. Kumar, R. Kumar, and A. Kumar, Comput. Math. Appl. 68, 454 (2014).