References
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- Gohberg , I.T. and Krein , M.G. 1976 . Introduction in the theory of the non‐self‐adjoint operators in the Gilbert's space , Moskow : Nauka . (in Russian)
- Menke , K. 1983 . Complex Variables Theory Appl. , 2 : 165 – 175 .
- Adamyan , V. M. , Arov , D. Z. and Krein , M. G. 1971 . Math, trans. , 86 : 34 – 75 . (in Russian)