?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Pham%2C+Thi+Ngan&rft.aulast=Pham&rft.aufirst=Thi+Ngan&rft.date=13+November+2012&rft.title=Named+Entity+Recognition+for+Vietnamese+Documents+Using+Semi-supervised+Learning+Method+of+CRFs+with+Generalized+Expectation+Criteria&rft.genre=proceeding