1. J.J. Stoker, Water Waves: the Mathematical Theory with Applications (Wiley, 1958; Inostr. Lit., Moscow, 1959).
2. V.Yu. Lyapidevskii and V.M. Teshukov,Mathematical Models of the Propagation of Long Waves in an Inhomogeneous Fluid (Publishing House of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, 2000) [in Russian].
3. A.A. Chesnokov and V.Yu. Lyapidevskii, “Wave Motions of an Ideal Fluid in an Open Narrow Channel,” Zh. Prikl. Mekh. Tekh. Fiz. 50, No. 2, 61–71 (2009).
4. V.E. Zakharov, “Benney Equations and the Quasi-Classical Approximation in the Inverse Scattering Method,” Funktsion. Analiz i Ego Pril. 14, No. 2, 15–24 (1980).
5. V.M. Teshukov, “Hyperbolicity of Long Wave Equations,” Dokl. Akad. Nauk SSSR 284, No. 3, 555–562 (1985).