@article{MASLO_2007__57_6_a2,
     author = {Bukac, Josef},
     title = {Upper integral and its geometric meaning},
     journal = {Mathematica slovaca},
     pages = {[523]},
     publisher = {mathdoc},
     volume = {57},
     number = {6},
     year = {2007},
     mrnumber = {2358396},
     zbl = {1164.28003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_2007__57_6_a2/}
}