Geodesic
An Indefinite Approach to the Reduction of a Nonnegative Hamiltonian Operator Function to a Block Diagonal Form
Funkcionalʹnyj analiz i ego priloženiâ, Tome 35 (2001) no. 3, pp. 73-75 
T. Ya. Azizov; V. K. Kiriakidi; G. A. Kurina. An Indefinite Approach to the Reduction of a Nonnegative Hamiltonian Operator Function to a Block Diagonal Form. Funkcionalʹnyj analiz i ego priloženiâ, Tome 35 (2001) no. 3, pp. 73-75. http://geodesic.mathdoc.fr/item/FAA_2001_35_3_a6/
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     title = {An {Indefinite} {Approach} to the {Reduction} of a {Nonnegative} {Hamiltonian} {Operator} {Function} to a {Block} {Diagonal} {Form}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
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     url = {http://geodesic.mathdoc.fr/item/FAA_2001_35_3_a6/}
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[2] Kurina G. A., Martynenko G. V., Dokl. RAN, 371:5 (2000), 594–596 | MR | Zbl

[3] Azizov T. Ya., Iokhvidov I. S., Osnovy teorii lineinykh operatorov v prostranstvakh s indefinitnoi metrikoi, Nauka, M., 1986 | MR

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[5] Sibuya Y., “Some global properties of matrices of functions of one variable”, Math. Ann., 4 (1965), 67–77 | DOI | MR