Qiang Zhang Erdun Zhao Jian Zhao Energy-Efficient with Optimal Balanced-Factor by Transmission Range Adjustment in WSNs. 1042-1047 2008 ICNSC http://dx.doi.org/10.1109/ICNSC.2008.4525370 conf/icnsc/2008 db/conf/icnsc/icnsc2008.html#ZhangZZ08