?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Pham%2C+Thanh+Huyen&rft.aulast=Pham&rft.aufirst=Thanh+Huyen&rft.date=16+December+2020&rft.title=A+Definition+of+Covering+Based+Decision+Table+and+Its+Sample+Applications&rft.genre=proceeding