%0 Journal Article %A J. Kurzweil %T A characterization of analytic operations in real Banach spaces %J Studia Mathematica %D 1953 %P 82-83 %V 14 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-14-1-82-83/ %R 10.4064/sm-14-1-82-83 %G en %F 10_4064_sm_14_1_82_83