Generalized periodic solutions of nonlinear telegraph equations

paper completes the study of generalized periodic solutions of nonlinear telegraph equation of the form Bu, + u,, - Kr, - pa + +vu- ++(u)= h(t,x) (1.1) (where /I # 0, CL, v are real parameters, $ is a continuous and bounded real function and h is square Lebesgue integrable over I2 with I = [0,2n]) initiated in [I]. Recall that a generalized periodic solution of (1.1) (shortly GPS) is a real function u E