%0 Journal Article %A R. K. Vasil'ev %T On some convergence questions for isotone and positive additive operators %J Doklady Akademii Nauk %D 1974 %P 260-263 %V 217 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1974_217_2_a1/ %G ru %F DAN_1974_217_2_a1