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Siberian Mathematical Journal > 2018 > 59 > 6 > 1014-1023
Siberian Mathematical Journal > 2017 > 58 > 5 > 794-800
Siberian Mathematical Journal > 2018 > 59 > 6 > 1014-1023
Siberian Mathematical Journal > 2017 > 58 > 5 > 794-800