@article{PDMA_2020_13_a14,
     author = {N. V. Medvedeva and S. S. Titov},
     title = {Constructions of non-endomorphic perfect ciphers},
     journal = {Prikladnaya Diskretnaya Matematika. Supplement},
     pages = {51--54},
     publisher = {mathdoc},
     number = {13},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDMA_2020_13_a14/}
}