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Translated from Matematicheskie Zametki, Vol. 48, No. 1, pp. 47–55, July, 1990.
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Kuliev, T.Y. Filtered products, direct integrals, and convex analysis of numerical ranges. Mathematical Notes of the Academy of Sciences of the USSR 48, 653–658 (1990). https://doi.org/10.1007/BF01164262
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DOI: https://doi.org/10.1007/BF01164262