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@article{NUMA_1981__37_132734, author = {P. Neittaanm\"aki and J. Saranen}, title = {On {Finite} {Element} {Approximation} of the {Gradient} for {Solution} of {Poisson} {Equation.}}, journal = {Numerische Mathematik}, pages = {333--338}, publisher = {mathdoc}, volume = {37}, year = {1981}, zbl = {0463.65073}, url = {http://geodesic.mathdoc.fr/item/NUMA_1981__37_132734/} }
P. Neittaanmäki; J. Saranen. On Finite Element Approximation of the Gradient for Solution of Poisson Equation.. Numerische Mathematik, Tome 37 (1981), pp. 333-338. http://geodesic.mathdoc.fr/item/NUMA_1981__37_132734/