Geodesic
Numerical ranges, zones, and spectra of families of selfadjoint operators
Doklady Akademii Nauk, Tome 257 (1981) no. 5, pp. 1033-1037.

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     author = {Yu. Sh. Abramov},
     title = {Numerical ranges, zones, and spectra of families of selfadjoint operators},
     journal = {Doklady Akademii Nauk},
     pages = {1033--1037},
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     year = {1981},
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     url = {http://geodesic.mathdoc.fr/item/DAN_1981_257_5_a0/}
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Yu. Sh. Abramov. Numerical ranges, zones, and spectra of families of selfadjoint operators. Doklady Akademii Nauk, Tome 257 (1981) no. 5, pp. 1033-1037. http://geodesic.mathdoc.fr/item/DAN_1981_257_5_a0/