@article{FAA_2009_43_2_a8,
     author = {V. S. Rabinovich and S. Roch},
     title = {Essential {Spectrum} of {Difference} {Operators} on {Periodic} {Metric} {Spaces}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {83--87},
     publisher = {mathdoc},
     volume = {43},
     number = {2},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_2009_43_2_a8/}
}