Quanbin Chen Jian Ma Yanmin Zhu Dian Zhang Lionel M. Ni An Energy-Efficient K-Hop Clustering Framework for Wireless Sensor Networks. 17-33 2007 conf/ewsn/2007 EWSN http://dx.doi.org/10.1007/978-3-540-69830-2_2 db/conf/ewsn/ewsn2007.html#ChenMZZN07