@article{RMF_2012_87_1_a5,
     author = {Calda, Emil},
     title = {\v{C}tverec opsan\'y dan\'emu \v{c}ty\v{r}\'uheln{\'\i}ku},
     journal = {Rozhledy matematicko-fyzik\'aln{\'\i}},
     pages = {36--38},
     year = {2012},
     volume = {87},
     number = {1},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/RMF_2012_87_1_a5/}
}