@article{UM_2006_14_1_a5,
     author = {Zelinka, Bohdan},
     title = {$16=2^4=4^2$},
     journal = {U\v{c}itel matematiky},
     pages = {39--40},
     year = {2006},
     volume = {14},
     number = {1},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_2006_14_1_a5/}
}