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@article{MZM_1997_62_5_a15, author = {A. M. Gomilko and G. V. Radzievskii}, title = {On the numerical ranges of a family of commuting operators}, journal = {Matemati\v{c}eskie zametki}, pages = {787--791}, publisher = {mathdoc}, volume = {62}, number = {5}, year = {1997}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1997_62_5_a15/} }
A. M. Gomilko; G. V. Radzievskii. On the numerical ranges of a family of commuting operators. Matematičeskie zametki, Tome 62 (1997) no. 5, pp. 787-791. http://geodesic.mathdoc.fr/item/MZM_1997_62_5_a15/