@article{PDM_2009_3_a6,
     author = {I. V. Pankratov},
     title = {Symmetric stream and finite automaton ciphersystems},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {59--68},
     publisher = {mathdoc},
     number = {3},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2009_3_a6/}
}