Ziguo Zhong Ting Zhu Tian He Zhi-Li Zhang Leakage-aware energy synchronization on twin-star nodes. 351-352 2008 SenSys http://doi.acm.org/10.1145/1460412.1460447 conf/sensys/2008 db/conf/sensys/sensys2008.html#ZhongZHZ08