@article{RMF_2007_82_4_a5,
     author = {Jedin\'ak, Du\v{s}an},
     title = {Listy z kalend\'ara. {J\'anos} {Bolyai}},
     journal = {Rozhledy matematicko-fyzik\'aln{\'\i}},
     pages = {32--33},
     year = {2007},
     volume = {82},
     number = {4},
     language = {sk},
     url = {http://geodesic.mathdoc.fr/item/RMF_2007_82_4_a5/}
}