@article{RMF_2012__87_4_a5,
     author = {Calda, Emil},
     title = {P\v{r}irozen\'a \v{c}{\'\i}sla ve \v{c}tvercov\'e s{\'\i}ti},
     journal = {Rozhledy matematicko-fyzik\'aln{\'\i}},
     pages = {30--32},
     publisher = {mathdoc},
     volume = {87},
     number = {4},
     year = {2012},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/item/RMF_2012__87_4_a5/}
}