%0 Journal Article %A Bukac, Josef %T Upper integral and its geometric meaning %J Mathematica slovaca %D 2007 %P [523] %V 57 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_2007__57_6_a2/ %G en %F MASLO_2007__57_6_a2