OUCHENANE, D., KHALILI, Z., & YAZID, F. (2022). Global nonexistence of solution for coupled nonlinear Klein-Gordon with degenerate damping and source terms. Studia Universitatis Babeș-Bolyai Mathematica, 67(4), 801–815. https://doi.org/10.24193/subbmath.2022.4.10