Geodesic
The algebraic structure of $H$-dissipative operators in a finite-dimensional space
Matematičeskie zametki, Tome 63 (1998) no. 2, pp. 163-169.

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We study properties of Jordan representations of $H$-dissipative operators in a finite-dimensional indefinite $H$-space. An algebraic proof is given of the fact that such operators always have maximal semidefinite invariant subspaces. 
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T. Ya. Azizov; A. I. Barsukov. The algebraic structure of $H$-dissipative operators in a finite-dimensional space. Matematičeskie zametki, Tome 63 (1998) no. 2, pp. 163-169. http://geodesic.mathdoc.fr/item/MZM_1998_63_2_a0/

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