%0 Journal Article %A J. Bryszewski %T On a class of multi-valued vector fields in Banach spaces %J Fundamenta Mathematicae %D 1977 %P 1-8 %V 97 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-97-1-1-8/ %R 10.4064/fm-97-1-1-8 %G en %F 10_4064_fm_97_1_1_8