1. Aliev, A.B., Lichaei, B.H.: Existence and nonexistence of global solutions of the Cauchy problem for higher order semilinear pseudohyperbolic equations. J. Nonlinear Anal. Theory Methods Appl. 72(7—-8), 3275–3288 (2010)
2. Evans, L.C.: Partial differential equations. In: Graduate Student of Mathematics, vol 19. American Mathematical Society, Providence, RI (1998)
3. Galactionov, V.A., Mitidieri, E.L., Pohozaev, S.I: Blow-up for Higher-Order Parabolic, Hyperbolic, Dispersion and Schrodinger Equations. Series: Chapman & Hall/CRC Monographs and Research Notes in Mathematics (2014)
4. Hörmander, L.: The Analysis of Linear Partial Differential Operators II. Differential Operators with Constant Coefficients. Springer, Berlin (1983)
5. Kharibegashvili, S.: Boundary value problems for some classes of nonlinear wave equations. Mem. Differ. Equ. Math. Phys. 46, 1–114 (2009)