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Translated from Trudy Seminara imeni I. G. Petrovskogo, No. 28, Part I, pp. 5–7, 2011.
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I. V. Astashova., A. V. Borovskikh., V. V. Bykov. et al. Olga Arsenjevna Oleinik. J Math Sci 179, 345–346 (2011). https://doi.org/10.1007/s10958-011-0598-x
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DOI: https://doi.org/10.1007/s10958-011-0598-x