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Translated from Matematicheskie Zametki, Vol. 40, No. 2, pp. 197–202, August, 1986.
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Vagabov, A.I. Completeness of the eigenfunctions of irregular differential operators in a space of vector-valued functions. Mathematical Notes of the Academy of Sciences of the USSR 40, 611–614 (1986). https://doi.org/10.1007/BF01159115
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DOI: https://doi.org/10.1007/BF01159115