Yazid, Fares, and Djamel Ouchenane. “Exponential Growth of Solutions With $L_{p}$-Norm of a Klein-Gordon Wave Equation With Strong Damping, Source and Delay Terms”. Discontinuity, Nonlinearity, and Complexity, vol. 12, no. 2, Aug. 2026, pp. 265-73, https://doi.org/10.5890/DNC.2023.06.003.