1. Nonlinear semigroups and differential equations in Banach spaces
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4. Problems of evolution in metric spaces and maximal decreasing curve;De Giorgi, Ennio;Atti Accad. Naz. Lincei Rend. Cl. Sci. Fis. Mat. Nat. (8),1980
5. On solving certain nonlinear partial differential equations by accretive operator methods;Evans, Lawrence C.;Israel J. Math.,1980