@article{LI Han-Wen:29, author = {LI Han-Wen}, title = {}, publisher = {Journal of Guizhou University of Finance and Economics}, year = {2010}, journal = {Journal of Guizhou University of Finance and Economics}, volume = {28}, number = {5}, eid = {29}, numpages = {0}, pages = {29}, keywords = {}, url = {https://gcxb.gufe.edu.cn/EN/abstract/article_8376.shtml}, doi = {} }