@article{MVK_2012_3_a4,
     author = {S. V. Polin},
     title = {Certainly solvable equations on algebraic systems},
     journal = {Matemati\v{c}eskie voprosy kriptografii},
     pages = {91--125},
     publisher = {mathdoc},
     volume = {3},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MVK_2012_3_a4/}
}