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Additional information
A. M. Gor'kii Kharkov State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 5, No. 1, pp. 37–47, January–March, 1971.
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Katsnel'son, V.É. Exponential bases in L2 . Funct Anal Its Appl 5, 31–38 (1971). https://doi.org/10.1007/BF01075845
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DOI: https://doi.org/10.1007/BF01075845