%0 Journal Article %A Mykola Komarnitskiy %A Roman Oliynyk %T Preradical and kernel functors over categories of $S$-acts %J Algebra and discrete mathematics %D 2010 %P 57-66 %V 10 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/ADM_2010_10_1_a5/ %G en %F ADM_2010_10_1_a5