Karachalios, Nikos, and Nikos M. Stavrakakis. “Asymptotic Behavior of Solutions of Some Nonlinearly Damped Wave Equations on $\mathbb R^N$”. Topological Methods in Nonlinear Analysis 18, no. 1 (September 1, 2001): 73–87. Accessed April 25, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.2001.024.