@article{DM_2001_13_4_a8,
     author = {V. A. Kolmykov},
     title = {On summation over paths in spectral graph theory},
     journal = {Diskretnaya Matematika},
     pages = {122--125},
     year = {2001},
     volume = {13},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2001_13_4_a8/}
}