@article{UM_2014_22_2_a4,
     author = {Calda, Emil},
     title = {Pravo\'uhl\'y troj\'uheln{\'\i}k trochu jinak},
     journal = {U\v{c}itel matematiky},
     pages = {119--120},
     year = {2014},
     volume = {22},
     number = {2},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_2014_22_2_a4/}
}