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Additional information
Institute of High Energy Physics, Serpukhov. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 24, No. 1, pp. 62–70, July, 1975.
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Tyurin, N.E. Lower bounds for the U matrix. Theor Math Phys 24, 669–675 (1975). https://doi.org/10.1007/BF01036627
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DOI: https://doi.org/10.1007/BF01036627