Aragão-Costa, E. R., Caraballo, T., Carvalho, A. N., & Langa, J. A. (2012). Continuity of Lyapunov functions and of energy level for a generalized gradient semigroup. Topological Methods in Nonlinear Analysis, 39(1), 57–82. Retrieved from https://apcz.umk.pl/TMNA/article/view/TMNA.2012.004