%0 Journal Article %A Weidemaier, Peter %T The trace theorem $W^{2,1}_p(\Omega_T) \ni f \mapsto \nabla_{\!x} f \in W^{1-1/p,1/2-1/2p}_p(\partial \Omega_T)$ revisited %J Commentationes Mathematicae Universitatis Carolinae %D 1991 %P 307-314 %V 32 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1991__32_2_a12/ %G en %F CMUC_1991__32_2_a12