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Russian Mathematics > 2019 > 63 > 3 > 78-82
Siberian Mathematical Journal > 2017 > 58 > 2 > 183-189
Russian Mathematics > 2015 > 59 > 5 > 58-63
Russian Mathematics > 2019 > 63 > 3 > 78-82
Siberian Mathematical Journal > 2017 > 58 > 2 > 183-189
Russian Mathematics > 2015 > 59 > 5 > 58-63