%0 Journal Article %A Porubský, Štefan %T Generalization of Some Results for Exactly Covering Systems %J Mathematica slovaca %D 1972 %P 208-214 %V 22 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1972__22_3_a2/ %G en %F MASLO_1972__22_3_a2