@article{UM_2012_20_1_a2,
     author = {Calda, Emil},
     title = {O jednom troj\'uheln{\'\i}ku eukleidovsky nesestrojiteln\'em},
     journal = {U\v{c}itel matematiky},
     pages = {23--25},
     year = {2012},
     volume = {20},
     number = {1},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_2012_20_1_a2/}
}