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- [23] Existence of solutions for a class of nonlinear impulsive wave equations Ricerche di Matematica, 2022, 71 : 211 - 225
- [24] Existence of subharmonic solutions for a class of retarded wave equation Zhongshan Daxue Xuebao/Acta Scientiarum Natralium Universitatis Sunyatseni, 2000, 39 (03): : 6 - 10