@article{PDMA_2021_14_a20,
     author = {N. V. Medvedeva and S. S. Titov},
     title = {To the task of description minimal by inclusion perfect ciphers},
     journal = {Prikladnaya Diskretnaya Matematika. Supplement},
     pages = {91--95},
     publisher = {mathdoc},
     number = {14},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDMA_2021_14_a20/}
}