?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Nguyen%2C+Quoc+Dat&rft.aulast=Nguyen&rft.aufirst=Quoc+Dat&rft.date=2015&rft.issn=1570-0844&rft.atitle=Ripple+Down+Rules+for+Question+Answering&rft.title=Semantic+Web+Journal&rft.genre=article