求三篇，非常感谢帮忙的朋友啊！
1. Game-theoretic medium access control protocol for wireless sensor networks http://ieeexplore.ieee.org/Xplore/defdeny.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fstamp%2Fstamp.jsp%3Ftp%3D%26arnumber%3D5159684%26userType%3D&denyReason=-134&arnumber=5159684&productsMatched=null&userType=

2. Cooperative transmission in wireless networks using incremental opportunistic relaying strategyhttp://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5343511&abstractAccess=no&userType=inst


3. Optimisation of cooperative spectrum sensing in cognitive radio network

http://ieeexplore.ieee.org/Xplore/defdeny.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fstamp%2Fstamp.jsp%3Ftp%3D%26arnumber%3D5109930%26userType%3Dinst&denyReason=-134&arnumber=5109930&productsMatched=null&userType=inst