@article{UM_2012_20_1_a12,
     author = {Calda, Emil},
     title = {O konci sv\v{e}ta, maysk\'em kalend\'a\v{r}i a planet\v{e} {Nibiru}},
     journal = {U\v{c}itel matematiky},
     pages = {61--64},
     year = {2012},
     volume = {20},
     number = {1},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_2012_20_1_a12/}
}