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Original Russian Text © V. P. Maslov, 2017, published in Matematicheskie Zametki, 2017, Vol. 101, No. 6, pp. 803–806.
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Maslov, V.P. My dear Ludvig. Math Notes 101, 925–927 (2017). https://doi.org/10.1134/S0001434617050182
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DOI: https://doi.org/10.1134/S0001434617050182