%0 Journal Article %A Frič, Roman %A Papčo, Martin %T Upgrading Probability via Fractions of Events %J Communications in Mathematics %D 2016 %P 29-41 %V 24 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/COMIM_2016__24_1_a3/ %G en %F COMIM_2016__24_1_a3