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Translated from Zapiski Nauchnykh Seminarov POMI, Vol. 408, 2012, pp. 7–8.
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Ildar Abdullovich Ibragimov. J Math Sci 199, 67 (2014). https://doi.org/10.1007/s10958-014-1833-z
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DOI: https://doi.org/10.1007/s10958-014-1833-z