Wang Liu Jianping Wang Guoliang Xing Liusheng Huang Throughput Capacity of Mobility-assisted Data Collection in Wireless Sensor Networks. 70-79 2009 MASS http://dx.doi.org/10.1109/MOBHOC.2009.5336933 conf/mass/2009 db/conf/mass/mass2009.html#LiuWXH09