?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Nguyen%2C+Hung+Son&rft.aulast=Nguyen&rft.aufirst=Hung+Son&rft.date=August+2018&rft.btitle=International+Joint+Conference+on+Rough+Sets&rft.tpages=50&rft.genre=book