Hideyuki Kawashima Motomichi Toyama Yuichiro Anzai Michita Imai Providing Persistence or Sensor Streams with Light Neighbor WAL. 257-264 2002 conf/prdc/2002 PRDC http://csdl.computer.org/comp/proceedings/prdc/2002/1852/00/18520257abs.htm db/conf/prdc/prdc2002.html#KawashimaTAI02