Konrad Iwanicki Maarten van Steen Multi-hop Cluster Hierarchy Maintenance in Wireless Sensor Networks: A Case for Gossip-Based Protocols. 102-117 2009 EWSN http://dx.doi.org/10.1007/978-3-642-00224-3_7 conf/ewsn/2009 db/conf/ewsn/ewsn2009.html#IwanickiS09