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@article{PIM_1981_N_S_29_43_a29, author = {Aleksandar Torga\v{s}ev}, title = {On {Spectra} of {Infinite} {Graphs}}, journal = {Publications de l'Institut Math\'ematique}, pages = {269 }, publisher = {mathdoc}, volume = {_N_S_29}, number = {43}, year = {1981}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PIM_1981_N_S_29_43_a29/} }
Aleksandar Torgašev. On Spectra of Infinite Graphs. Publications de l'Institut Mathématique, _N_S_29 (1981) no. 43, p. 269 . http://geodesic.mathdoc.fr/item/PIM_1981_N_S_29_43_a29/