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3. G. B. Whitham, Linear and Nonlinear Waves (JohnWiley & Sons, New York, 1974; Mir, Moscow, 1977).
4. G. V. Demidenko and S. V. Uspenskii, Equations and Systems Unsolved with Respect to the Higher Derivative (Nauchn. Kniga, Novosibirsk, 1998) [in Russian].
5. E. A. Utkina, “Uniqueness of the Solution of the Dirichlet Problem for a n-Dimensional Pseudoparabolic Equation,” Differentsial’nye Uravneniya 48 (10), 1443–1449 (2012).