@article{PDM_2012_3_a6,
     author = {A. V. Cheremushkin},
     title = {On the notion of electronic signature},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {53--69},
     publisher = {mathdoc},
     number = {3},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2012_3_a6/}
}