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Additional information
Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 12, No. 4, pp. 24–40, October–December, 1978.
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Kostyuchenko, A.G., Shkalinov, A.A. Summability of eigenfunction expansions of differential operators and convolution operators. Funct Anal Its Appl 12, 262–276 (1978). https://doi.org/10.1007/BF01076380
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DOI: https://doi.org/10.1007/BF01076380