@article{PDM_2010_12_a8,
     author = {S. A. Kiselyov},
     title = {On the reduction of key space for {A5/1}},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {21--23},
     publisher = {mathdoc},
     number = {12},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2010_12_a8/}
}