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2011-5-12

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��[1] ��ѧ��ǵ�[M].��ÿ�ѧ��磬1993��47-48.

��[2] ��ϼ.�Ͼ��ǳ��з�չ��ʵ֤�о�[D].�Ͼ��Ͼ��պ��ѧ��2005.

��[3] ��.��ָ��ۺ��۷��ϵͳ��[M].��й�ͳ�Ƴ��磬1991��21-144.

��[4] ��.�Գ��Χ�綨��۷��[J].�ƾ��о��2005��(11)��108-114.

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