@article{UM_2007_15_2_a3,
     author = {Kobza, Ale\v{s}},
     title = {Planimetrick\'a \'uloha o extr\'emu},
     journal = {U\v{c}itel matematiky},
     pages = {89--94},
     year = {2007},
     volume = {15},
     number = {2},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_2007_15_2_a3/}
}