@article{PDM_2012_2_a1,
     author = {V. A. Romankov},
     title = {Diophantine cryptography over infinite groups},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {15--42},
     publisher = {mathdoc},
     number = {2},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2012_2_a1/}
}