@article{PDM_2021_4_a1,
     author = {D. I. Trifonov and D. B. Fomin},
     title = {Invariant subspaces in {SPN} block cipher},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {58--76},
     publisher = {mathdoc},
     number = {4},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2021_4_a1/}
}