López-Gómez, Julian, and Antonio Suárez. “Combining Fast, Linear and Slow Diffusion”. Topological Methods in Nonlinear Analysis 23, no. 2 (June 1, 2004): 275–300. Accessed April 25, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.2004.012.