?url_ver=Z39.88-2004&rft_id=10.1007%2Fs10776-019-00475-2&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Lam%2C+Sinh+Cong&rft.aulast=Lam&rft.aufirst=Sinh+Cong&rft.date=2020&rft.issn=1068-9605&rft.atitle=Fractional+Frequency+Reuse+in+Multi-tier+Networks%3A+Performance+Analysis+and+Optimization&rft.title=International+Journal+of+Wireless+Information+Networks&rft.genre=article