@article{UM_2005__13_2_a9,
     author = {Vrbsk\'y, Arne},
     title = {Turbodidaktika 4},
     journal = {U\v{c}itel matematiky},
     pages = {124--128},
     publisher = {mathdoc},
     volume = {13},
     number = {2},
     year = {2005},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/item/UM_2005__13_2_a9/}
}