@article{PDMA_2015_8_a22,
     author = {N. V. Medvedeva and S. S. Titov},
     title = {Non-endomorphic perfect ciphers with two elements in plaintext alphabet},
     journal = {Prikladnaya Diskretnaya Matematika. Supplement},
     pages = {63--66},
     publisher = {mathdoc},
     number = {8},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDMA_2015_8_a22/}
}