@misc{UM_1992_0_1_a22,
     title = {Matematick\'e rekreace},
     journal = {U\v{c}itel matematiky},
     pages = {30},
     year = {1992},
     volume = {0},
     number = {1},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_1992_0_1_a22/}
}