Siberian Mathematical Journal
Siberian Mathematical Journal > 2017 > 58 > 1 > 16-27
Siberian Mathematical Journal > 2017 > 58 > 1 > 176-182
Siberian Mathematical Journal > 2017 > 58 > 1 > 16-27
Siberian Mathematical Journal > 2017 > 58 > 1 > 176-182