%0 Journal Article %A Stanković Bogoljub %T On a class of operators %J Novi Sad Journal of Mathematics %D 1975 %P 9-12 %V 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/NSJOM_1975_5_Nonea_1/ %F NSJOM_1975_5_Nonea_1