@article{PDM_2011_13_a46,
     author = {E. O. Karmanova},
     title = {On congruences of paths},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {91--92},
     year = {2011},
     number = {13},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2011_13_a46/}
}