Diaz, J. I., and Ioan I. Vrabie. “Compactness of the Green Operator of Nonlinear Diffusion Equations: Aplication to Boussinesq Type Systems in Fluid Dynamics”. Topological Methods in Nonlinear Analysis 4, no. 2 (December 1, 1994): 399–416. Accessed July 22, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.1994.035.