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Journal of Mathematical Sciences > 2018 > 230 > 5 > 782-785
Czechoslovak Mathematical Journal > 2012 > 62 > 1 > 77-104
Theoretical and Mathematical Physics > 2008 > 157 > 3 > 1678-1693
Journal of Mathematical Sciences > 2018 > 230 > 5 > 782-785
Czechoslovak Mathematical Journal > 2012 > 62 > 1 > 77-104
Theoretical and Mathematical Physics > 2008 > 157 > 3 > 1678-1693