%0 Journal Article %A David Swanson %T A characterization of Sobolev spaces via local derivatives %J Colloquium Mathematicum %D 2010 %P 157-167 %V 119 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm119-1-11/ %R 10.4064/cm119-1-11 %G en %F 10_4064_cm119_1_11