Ki-Hyeon Kim Won-Kee Hong Hiecheol Kim Low Cost Time Synchronization Protocol for Wireless Sensor Network. 1137-1143 2009 92-B IEICE Transactions 4 http://search.ieice.org/bin/summary.php?id=e92-b_4_1137&category=B&year=2009&lang=E&abst= db/journals/ieicet/ieicet92b.html#KimHK09