@article{UM_2016_24_1_a5,
     author = {Calda, Emil},
     title = {Znovu o pravo\'uhl\'em troj\'uheln{\'\i}ku},
     journal = {U\v{c}itel matematiky},
     pages = {61--64},
     year = {2016},
     volume = {24},
     number = {1},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_2016_24_1_a5/}
}