@misc{UM_1996_4_4_a9,
     title = {Pozv\'anka},
     journal = {U\v{c}itel matematiky},
     pages = {247},
     year = {1996},
     volume = {4},
     number = {4},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_1996_4_4_a9/}
}