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References
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| 1. |
Akhiezer N. I., Glazman I. M., Teoriya lineinykh operatorov v gilbertovom prostranstve, Nauka, M., 1966  |
| 2. |
Berezanskii Yu. M., Razlozhenie po sobstvennym funktsiyam samosopryazhennykh operatorov, Naukova dumka, Kiev, 1965 |
| 3. |
Danford N. Shvarts Dzh. T., Lineinye operatory: Spektralnaya teoriya, Mir, M., 1966 |
| 4. |
Kostyuchenko A. G., Mirzoev K. A., “Obobschennye yakobievy matritsy i indeksy defekta obyknovennykh differentsialnykh operatorov s polinomialnymi koeffitsientami”, Funkts. anal. prilozh., 33:1 (1999), 30–45    |
| 5. |
Kostyuchenko A. G., Mirzoev K. A., “Priznaki vpolne neopredelennosti yakobievykh matrits s matrichnymi elementami”, Funkts. anal. prilozh., 35:4 (2001), 32–37 |
| 6. |
Krein M. G., “Osnovnye polozheniya teorii predstavleniya ermitovykh operatorov s indeksom defekta $(m,m)$”, Ukr. mat. zh., 2 (1949), 3–66 |
| 7. |
Krein M. G., “Beskonechnye $J$-matritsy i matrichnaya problema momentov”, Dokl. AN SSSR, 69:3 (1949), 125–128 |
| 8. |
Chistyakov A. L., “Indeksy defekta $J_m$-matrits i differentsialnykh operatorov s polinomialnymi koeffitsientami”, Mat. sb., 85 (127):4 (8) (1971), 474–503 |
| 9. |
Chistyakov A. L., “Indeksy defektov simmetricheskikh operatorov v pryamoi summe gilbertovykh prostranstv, I”, Vestn. MGU. Ser. mat. mekh., 1969, no. 3, 5–21 |
| 10. |
Chistyakov A. L., “Indeksy defektov simmetricheskikh operatorov v pryamoi summe gilbertovykh prostranstv, II”, Vestn. MGU. Ser. mat. mekh., 1969, no. 4, 3–5 |
