Geodesic
A~class of holomorphic operator functions
Matematičeskie zametki, Tome 5 (1969) no. 3, pp. 351-359.

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We shall consider holomorphic operator functions $F(\lambda)$ which have values that differ by a scalar factor from a $J$-semiunitary operator. We shall establish conditions under which the latter operator is independent of $\lambda$. 
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     author = {Yu. L. Shmul'yan},
     title = {A~class of holomorphic operator functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {351--359},
     publisher = {mathdoc},
     volume = {5},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_5_3_a9/}
}
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Yu. L. Shmul'yan. A~class of holomorphic operator functions. Matematičeskie zametki, Tome 5 (1969) no. 3, pp. 351-359. http://geodesic.mathdoc.fr/item/MZM_1969_5_3_a9/