@article{UM_2008_16_4_a2,
     author = {Hejn\'y, Milan},
     title = {Aritmetick\'e grafy},
     journal = {U\v{c}itel matematiky},
     pages = {209--217},
     year = {2008},
     volume = {16},
     number = {4},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_2008_16_4_a2/}
}