Bing Liu 0006 Ke Yu Lin Zhang Huimin Zhang MAC Performance and Improvement in Mobile Wireless Sensor Networks. 109-114 2007 SNPD (3) http://doi.ieeecomputersociety.org/10.1109/SNPD.2007.348 conf/snpd/2007 db/conf/snpd/snpd2007-3.html#LiuYZZ07