@article{UM_2015_23_4_a3,
     author = {V{\'\i}zek, Luk\'a\v{s}},
     title = {\v{R}e\v{s}en{\'\i} troj\'uheln{\'\i}ku},
     journal = {U\v{c}itel matematiky},
     pages = {226--234},
     year = {2015},
     volume = {23},
     number = {4},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_2015_23_4_a3/}
}