%0 Journal Article %A J. Kurzweil %T On approximation in real Banach spaces by analytic operations %J Studia Mathematica %D 1957 %P 124-129 %V 16 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-16-2-124-129/ %R 10.4064/sm-16-2-124-129 %G en %F 10_4064_sm_16_2_124_129