Doubly periodic solutions of a nonlinear wave equation with xdependent coefficie

Doublyperiodicsolutionsofanonlinearwaveequationwithx-dependentcoefficients，冀书关，，Thispaperisconcernedwiththedoublyperiodicsolutionsofthenonlinearwaveequationwith-dependentcoefficientsSuchamodelarisesfromtheforcedvibrationsofanonhomo