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- [4] EXISTENCE OF STATIONARY SOLUTIONS OF NONLINEAR-WAVE EQUATIONS PRIKLADNAYA MATEMATIKA I MEKHANIKA, 1974, 38 (05): : 922 - 928
- [9] A THEOREM OF GLOBAL EXISTENCE OF SOLUTIONS TO NONLINEAR-WAVE EQUATIONS IN 4 SPACE DIMENSIONS MONATSHEFTE FUR MATHEMATIK, 1990, 109 (02): : 123 - 134