@article{PDM_2012_4_a6,
     author = {N. N. Tokareva},
     title = {On the history of cryptography in {Russia}},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {82--107},
     year = {2012},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2012_4_a6/}
}