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References
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Novikov S.P., Funkts. analiz, 8:3 (1974), 54–66 |
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Dubrovin B.A., Funkts. analiz, 9:1 (1975), 65–66 |
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Its A.P., Matveev V.B., Funkts. analiz, 9:1 (1975), 69–70 |
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Shabat A.B., Dinamika sploshnoi sredy, no. 5, Novosibirsk, 1970, 130–145 |
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Kuznetsov E.A., Mikhailov A.V., preprint № 19, in-t avtomatiki i elektrometrii SO AN SSSR, Novosibirsk, 1974 |