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- [1] EXISTENCE OF STATIONARY SOLUTIONS OF NONLINEAR-WAVE EQUATIONS PRIKLADNAYA MATEMATIKA I MEKHANIKA, 1974, 38 (05): : 922 - 928
- [6] A NOTE ON EXISTENCE OF GLOBAL CLASSICAL-SOLUTIONS TO NONLINEAR-WAVE EQUATIONS ARKIV FOR MATEMATIK, 1988, 26 (01): : 145 - 153