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Mathematical Notes > 2019 > 105 > 3-4 > 342-350
Russian Mathematics > 2008 > 52 > 9 > 51-59
Annales Polonici Mathematici > 1993 > 58 > 3 > 267-273
Mathematical Notes > 2019 > 105 > 3-4 > 342-350
Russian Mathematics > 2008 > 52 > 9 > 51-59
Annales Polonici Mathematici > 1993 > 58 > 3 > 267-273