hal-01535147 title_s Discontinuous Galerkin gradient discretisations for the approximation of second-order differential operators in divergence form auteur Robert Eymard, Cindy Guichard journal Computational and Applied Mathematics doi 10.1007/s40314-017-0558-2 fichier_hal https://hal.archives-ouvertes.fr/hal-01535147/document annee 2017 Identifiant HAL 51855 1465577