%0 Journal Article %A Marko Huhtanen %A Olavi Nevanlinna %T Approximating real linear operators %J Studia Mathematica %D 2007 %P 7-25 %V 179 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm179-1-2/ %R 10.4064/sm179-1-2 %G en %F 10_4064_sm179_1_2