?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Nguyen%2C+Tien+Hoa&rft.aulast=Nguyen&rft.aufirst=Tien+Hoa&rft.date=November+2013&rft.title=Power+Optimization+for+Multiuser+MISO-OFDMA+Based+Cognitive+Radio+Systems&rft.genre=proceeding