@article{ �����:206, author = { �����, ������, �����}, title = {ҩ��е��ѡ�����֤}, publisher = {������ѧ�о�}, year = {2001}, journal = {������ѧ�о�}, volume = {5}, number = {3(ר��)}, eid = {206}, numpages = {3}, pages = {206}, keywords = {}, url = {http://smkx.hunnu.edu.cn/CN/abstract/article_1593.shtml}, doi = {} }