%0 Journal Article %A Knor, Martin %A Niepel, Ľudovít %A Šoltés, Ľubomír %T Centers in line graphs %J Mathematica slovaca %D 1993 %P 11-20 %V 43 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1993__43_1_a1/ %G en %F MASLO_1993__43_1_a1