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Translated from Matematicheskie Zametki, Vol. 45, No. 1, pp. 10–15, January–February, 1989.
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Garkavi, A.L. Haar's condition for systems of vector-valued functions. Mathematical Notes of the Academy of Sciences of the USSR 45, 7–11 (1989). https://doi.org/10.1007/BF01158708
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DOI: https://doi.org/10.1007/BF01158708