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[1]�ν��P. С��(zh��n)��ˮ̎��S��O��η�[J ] . �Ї��h(hu��n)��,2004 ,4 :29.
[2]��.�Wؐ��ϵĹ��̑��о�[J ] . �Ї��oˮ��ˮ,1999 , (7) .
[3]��. ˮ̎��[M] . ��:�Ї��I(y��)��,2000 :1802181.

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