%0 Journal Article %A A. Benkirane %A J.-P. Gossez %T An approximation theorem in higher order Orlicz-Sobolev spaces and applications %J Studia Mathematica %D 1989 %P 231-255 %V 92 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-92-3-231-255/ %R 10.4064/sm-92-3-231-255 %G en %F 10_4064_sm_92_3_231_255