?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Nguyen%2C+Van+Toan&rft.aulast=Nguyen&rft.aufirst=Van+Toan&rft.date=2013&rft.title=Downlink+Channel+Allocation+Scheme+Deploying+Cooperative+Spectrum+Monitoring+for+Cognitive+Cellular-Femtocell+Networks&rft.genre=proceeding