Geodesic
On the regularity of spectral function of J-unitary J-dissipative operator
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (1988), pp. 22-30.

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The spectral resolution of J-unitary, J-dissipative operator is obtained and the regularity of its spectral function is studied. 
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R. V. Akopyan. On the regularity of spectral function of J-unitary J-dissipative operator. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (1988), pp. 22-30. http://geodesic.mathdoc.fr/item/UZERU_1988_2_a3/

[1] M. S. Brodskii, Treugolnye i zhordanovy predstavleniya lineinykh operatorov, Nauka, M., 1969

[2] Krein M.G. i Shmulyan Yu.L., “J-polyarnoe predstavlenie plyus-operatorov”, Matem. issled., 1:1 (1966), 131–161 | MR | Zbl