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Published in Russian Doklady Akademii Nauk, 2011, Vol. 437, No. 1, pp. 7–8.
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Al’pin, Y.A., Ikramov, K.D. A criterion for unitary congruence between matrices. Dokl. Math. 83, 141–142 (2011). https://doi.org/10.1134/S1064562411020013
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DOI: https://doi.org/10.1134/S1064562411020013