%0 Journal Article %A Babuška, Ivo %T Approximation by Hill functions. II. %J Commentationes Mathematicae Universitatis Carolinae %D 1972 %P 1-22 %V 13 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1972__13_1_a0/ %G en %F CMUC_1972__13_1_a0