Geodesic
The riemann boundary problem with a~complex orthogonal matrix
Matematičeskie zametki, Tome 23 (1978) no. 3, pp. 405-416.

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The Riemann boundary problem is studied under the assumption that the coefficient of the problem is a complex orthogonal matrix. In this case a property of the partial indices of the problem is established together with certain properties of the canonical matrices, which are then used to construct the canonical matrix of a complex orthogonal matrix of second order. 
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     author = {V. D. Didenko and V. A. Chernetskii},
     title = {The riemann boundary problem with a~complex orthogonal matrix},
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V. D. Didenko; V. A. Chernetskii. The riemann boundary problem with a~complex orthogonal matrix. Matematičeskie zametki, Tome 23 (1978) no. 3, pp. 405-416. http://geodesic.mathdoc.fr/item/MZM_1978_23_3_a8/