@article{PDM_2010_12_a27,
     author = {P. A. Pautov},
     title = {Authentication in multi-tier system using commutative encryption},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {59--60},
     publisher = {mathdoc},
     number = {12},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2010_12_a27/}
}