BAAZIZ, Islem, et al. “General Decay Rates of the Solution Energy in a Viscoelastic Wave Equation With Boundary Feedback and a Nonlinear Source”. Studia Universitatis Babeș-Bolyai Mathematica, vol. 69, no. 2, June 2024, pp. 383-97, doi:10.24193/subbmath.2024.2.09.