@article{MVK_2010_1_2_a3,
     author = {V. L. Kurakin},
     title = {Free shift {registers.~IV}},
     journal = {Matemati\v{c}eskie voprosy kriptografii},
     pages = {57--92},
     year = {2010},
     volume = {1},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MVK_2010_1_2_a3/}
}