Tiankui Zhang Zhimin Zeng Yu Qiu A Subcarrier Allocation Algorithm for Utility Proportional Fairness in OFDM Systems. 1901-1905 2008 VTC Spring http://dx.doi.org/10.1109/VETECS.2008.431 conf/vtc/2008s db/conf/vtc/vtc2008s.html#ZhangZQ08