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Wuhan University Journal of Natural Sciences > 2015 > 20 > 2 > 101-105
Aequationes mathematicae > 2013 > 86 > 1-2 > 107-135
Wuhan University Journal of Natural Sciences > 2015 > 20 > 2 > 101-105
Aequationes mathematicae > 2013 > 86 > 1-2 > 107-135