@article{UM_2005__13_2_a4,
     author = {Hrub\'y, Dag},
     title = {O d\r{u}kazu jedn\'e nerovnosti},
     journal = {U\v{c}itel matematiky},
     pages = {89--93},
     publisher = {mathdoc},
     volume = {13},
     number = {2},
     year = {2005},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/item/UM_2005__13_2_a4/}
}