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M. V. Lomonosov Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 25, No. 2, pp. 38–49, April–June, 1991.
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Veselov, A.P. Integrable Lagrangian correspondences and the factorization of matrix polynomials. Funct Anal Its Appl 25, 112–122 (1991). https://doi.org/10.1007/BF01079590
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DOI: https://doi.org/10.1007/BF01079590