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Lobachevskii Journal of Mathematics > 2019 > 40 > 4 > 469-478
Russian Mathematics > 2018 > 62 > 10 > 37-46
Journal of Contemporary Mathematical Analysis (Armenian Academy of Sciences) > 2014 > 49 > 6 > 270-276
Russian Mathematics > 2009 > 53 > 10 > 61-63