The obstacle problem for degenerate doubly nonlinear equations of porous medium type (2020) Schätzler L Journal article Higher regularity for solutions to elliptic systems in divergence form subject to mixed boundary conditions (2019) Haller-Dintelmann R, Meinlschmidt H, Wollner W Journal article A -free rigidity and applications to the compressible Euler system (2017) Chiodaroli E, Feireisl E, Kreml O, Wiedemann E Journal article Partial regularity for nonlinear elliptic systems with continuous growth exponent (2013) Habermann J Journal article Equivalence between some definitions for the optimal mass transport problem and for the transport density on manifolds (2005) Pratelli A Journal article Regularity of almost minimizers of quasi-convex variational integrals with subquadratic growth (2005) Duzaar F, Grotowski JF, Kronz M Journal article Stabilization of Ill-Posed Cauchy Problems for Parabolic Equations (1987) Knabner P, Vessella S Journal article