?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Nguyen%2C+Pham+Xuan&rft.aulast=Nguyen&rft.aufirst=Pham+Xuan&rft.date=October+2013&rft.title=A+New+Improved+Term+Weighting+Scheme+for+Text+Categorization&rft.genre=proceeding