@article{PDM_2008_2_a13,
     author = {A. M. Grishin},
     title = {Methods for protecting speech information},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {67--70},
     publisher = {mathdoc},
     number = {2},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2008_2_a13/}
}