@ARTICLE{6392312, 
author={J. Zou and H. Xiong and D. Wang and C. W. Chen}, 
journal={IEEE Transactions on Vehicular Technology}, 
title={Optimal Power Allocation for Hybrid Overlay/Underlay Spectrum Sharing in Multiband Cognitive Radio Networks}, 
year={2013}, 
volume={62}, 
number={4}, 
pages={1827-1837}, 
keywords={cognitive radio;electronic commerce;overlay networks;probability;quality of service;radio networks;radio spectrum management;relay networks (telecommunication);wireless channels;CR;PU;QoS;SU;auction-based power-allocation scheme;hybrid overlay-underlay spectrum sharing system;multiband cognitive radio network;multiple secondary user transmission;outage probability;primary user;quality of service;relay allocation;wireless channel;Games;Hybrid power systems;Interference;Quality of service;Relays;Resource management;Sensors;Auction game;cognitive radio (CR);hybrid spectrum sharing;outage probability;power allocation}, 
doi={10.1109/TVT.2012.2235152}, 
ISSN={0018-9545}, 
month={May},}

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6392312&newsearch=true&queryText=Optimal%20Power%20Allocation%20for%20Hybrid%20Overlay%2FUnderlay%20Spectrum%20Sharing%20in%20Multiband%20Cognitive%20Radio%20Networks