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@article{MZM_1995_58_6_a18, author = {A. A. Shkalikov}, title = {On~the essential spectrum of matrix operators}, journal = {Matemati\v{c}eskie zametki}, pages = {945--949}, publisher = {mathdoc}, volume = {58}, number = {6}, year = {1995}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1995_58_6_a18/} }
A. A. Shkalikov. On~the essential spectrum of matrix operators. Matematičeskie zametki, Tome 58 (1995) no. 6, pp. 945-949. http://geodesic.mathdoc.fr/item/MZM_1995_58_6_a18/