Sangsoon Lim Jiwoong Jeong Jongkeun Na Chong-kwon Kim Performance enhancement of low power listening MAC for duty cycled wireless sensor networks. 1-5 2009 ICOIN http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4897256 conf/icoin/2009 db/conf/icoin/icoin2009.html#LimJNK09