@misc{UM_1993_1_4_a22,
     title = {Knihovni\v{c}ka u\v{c}itele},
     journal = {U\v{c}itel matematiky},
     pages = {56},
     year = {1993},
     volume = {1},
     number = {4},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_1993_1_4_a22/}
}