Yutaro Sasaki Hidehisa Nakayama Nirwan Ansari Yoshiaki Nemoto Nei Kato A New Data Gathering Scheme Based on Set Cover Algorithm for Mobile Sinks in WSNs. 725-729 2008 GLOBECOM http://dx.doi.org/10.1109/GLOCOM.2008.ECP.145 conf/globecom/2008 db/conf/globecom/globecom2008.html#SasakiNANK08