@article{UM_2019__27_4_a5,
     author = {Pastor, Karel},
     title = {Kalaha jako didaktick\'a pom\r{u}cka},
     journal = {U\v{c}itel matematiky},
     pages = {258--264},
     publisher = {mathdoc},
     volume = {27},
     number = {4},
     year = {2019},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/item/UM_2019__27_4_a5/}
}