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Additional information
Institute of Theoretical Physics, Academy of Sciences of the Ukrainian SSR. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 23, No. 3, pp. 335–347, June, 1975.
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Énol'skii, V.Z. Topological properties of Landau curves in connection with Mandelstam's conjecture. Theor Math Phys 23, 552–560 (1975). https://doi.org/10.1007/BF01041674
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DOI: https://doi.org/10.1007/BF01041674