%0 Journal Article %A Lutz Klotz %T Some approximation problems in $L^{p}$-spaces of matrix-valued functions %J Studia Mathematica %D 1991 %P 129-147 %V 99 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-99-2-129-147/ %R 10.4064/sm-99-2-129-147 %G en %F 10_4064_sm_99_2_129_147