?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Nguyen%2C+Duc+Kien&rft.aulast=Nguyen&rft.aufirst=Duc+Kien&rft.date=March+2013&rft.title=Performance+Study+of+Chanel+Allocation+Schemes+for+beyond+4G+Cognitive+Femtocell-cellular+Mobile+Networks&rft.genre=proceeding