Geodesic
Numerical range and spectrum of joint holomorphic operator-valued functions of several complex variables
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 32 (1977) no. 6 
G. A. Isaev. Numerical range and spectrum of joint holomorphic operator-valued functions of several complex variables. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 32 (1977) no. 6. http://geodesic.mathdoc.fr/item/RM_1977_32_6_a28/
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     author = {G. A. Isaev},
     title = {Numerical range and spectrum of joint holomorphic operator-valued functions of several complex variables},
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     year = {1977},
     volume = {32},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1977_32_6_a28/}
}
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