@article{DA_2011_18_2_a4,
     author = {S. A. Kiselev and N. N. Tokareva},
     title = {On reduction of key space of the cipher {A5/1} and on reversibility of the next-state function for a~stream generator},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {51--63},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2011_18_2_a4/}
}