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Science China Information Sciences > 2003 > 46 > 6 > 466-474
Science China Information Sciences > 2003 > 46 > 5 > 371-380
Czechoslovak Mathematical Journal > 2002 > 52 > 3 > 449-461
Science China Information Sciences > 2003 > 46 > 6 > 466-474
Science China Information Sciences > 2003 > 46 > 5 > 371-380
Czechoslovak Mathematical Journal > 2002 > 52 > 3 > 449-461