@article{PDM_2011_2_a7,
     author = {E. O. Karmanova},
     title = {On congruences of paths},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {96--100},
     publisher = {mathdoc},
     number = {2},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2011_2_a7/}
}