%0 Journal Article %A Maliszewski, Aleksander %T On the differences of upper semicontinuous quasi-continuous functions %J Mathematica slovaca %D 1998 %P 245-252 %V 48 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1998__48_3_a3/ %G en %F MASLO_1998__48_3_a3