@misc{UM_1993_1_4_a21,
     title = {Sborn{\'\i}k 4. setk\'an{\'\i} u\v{c}itel\r{u} matematiky v\v{s}ech typ\r{u} a stup\v{n}\r{u} \v{s}kol},
     journal = {U\v{c}itel matematiky},
     pages = {55--56},
     year = {1993},
     volume = {1},
     number = {4},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_1993_1_4_a21/}
}