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Acta Mathematica Sinica, English Series > 2004 > 20 > 6 > 1095-1102
Acta Mathematica Sinica, English Series > 2004 > 20 > 6 > 1095-1102
Acta Mathematica Sinica, English Series > 2004 > 20 > 6 > 1095-1102
Acta Mathematica Sinica, English Series > 2004 > 20 > 6 > 1095-1102