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Acta Mathematica Sinica, English Series > 2002 > 18 > 1 > 27-36
Czechoslovak Mathematical Journal > 2000 > 50 > 4 > 803-823
Annales Polonici Mathematici > 1992 > 57 > 3 > 269-281
Acta Mathematica Sinica, English Series > 2002 > 18 > 1 > 27-36
Czechoslovak Mathematical Journal > 2000 > 50 > 4 > 803-823
Annales Polonici Mathematici > 1992 > 57 > 3 > 269-281