%0 Journal Article %A Porubský, Štefan %T Identities involving covering systems. II. %J Mathematica slovaca %D 1994 %P 555-568 %V 44 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1994__44_5_a6/ %G en %F MASLO_1994__44_5_a6