@misc{UM_1997__5_2_a11,
     title = {Drogy},
     journal = {U\v{c}itel matematiky},
     publisher = {mathdoc},
     volume = {05},
     number = {2},
     year = {1997},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/item/UM_1997__5_2_a11/}
}