@article{PDM_2017_4_a3,
     author = {G. P. Agibalov},
     title = {Substitution block ciphers with functional keys},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {57--65},
     publisher = {mathdoc},
     number = {4},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PDM_2017_4_a3/}
}