Megumi Kaneko Petar Popovski Joachim Dahl Proportional Fairness in Multi-Carrier System with Multi-Slot Frames: Upper Bound and User Multiplexing Algorithms. 22-26 2008 7 IEEE Transactions on Wireless Communications 1 http://dx.doi.org/10.1109/TWC.2008.060443 db/journals/twc/twc7.html#KanekoPD08