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[2]��U��c��á��ί��. ��U��c��[M]. ��: ұ�𹤘I(y��)��, 1995.

[3] ��. ��I(y��)�Uˮ��ؽ��x�ӵ�̎��[J]. ��нo��ˮ. 2007, 21(5): 23-25

[4] ��Ƽ, ��, ��. ̎��ؽ��ُUˮ��g��о��Mչ[J]. �h(hu��n)��ƌW�c��, 2006, 31(7): 103-108.

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