@article{PDM_2011_4_a3,
     author = {A. U. Zubov},
     title = {Almost perfect ciphers and authentication codes},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {28--33},
     publisher = {mathdoc},
     number = {4},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2011_4_a3/}
}