A new finite volume scheme for anisotropic diffusion problems on general grids: convergence analysis

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Small-stencil 3D schemes for diffusive flows in porous media (2012, background): “As stated in the introduction, the general idea of the small-stencil hybrid vertex scheme is to introduce a discrete gradient along the same line of thought as that of [17] (this discrete gradient depends on cell and faces unknowns), and to use this discrete gradient to build a discrete bilinear for”