@article{MZM_2006_80_5_a12,
     author = {A. Torgasev and M. Petrovi\'c},
     title = {On the {Laplacian} spectrum of an infinite graph},
     journal = {Matemati\v{c}eskie zametki},
     pages = {773--785},
     publisher = {mathdoc},
     volume = {80},
     number = {5},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2006_80_5_a12/}
}