Amir Leshem Ephraim Zehavi Yoav Yaffe Multichannel Opportunistic Carrier Sensing for Stable Channel Access Control in Cognitive Radio Systems. 82-95 2012 30 IEEE Journal on Selected Areas in Communications 1 http://dx.doi.org/10.1109/JSAC.2012.120108 db/journals/jsac/jsac30.html#LeshemZY12