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@article{DM_2004_16_3_a8, author = {V. A. Kolmykov}, title = {On the characteristic polynomials of periodic graphs}, journal = {Diskretnaya Matematika}, pages = {153--159}, publisher = {mathdoc}, volume = {16}, number = {3}, year = {2004}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DM_2004_16_3_a8/} }
V. A. Kolmykov. On the characteristic polynomials of periodic graphs. Diskretnaya Matematika, Tome 16 (2004) no. 3, pp. 153-159. http://geodesic.mathdoc.fr/item/DM_2004_16_3_a8/