Pietro Ciciriello Luca Mottola Gian Pietro Picco Efficient Routing from Multiple Sources to Multiple Sinks in Wireless Sensor Networks. 34-50 2007 conf/ewsn/2007 EWSN http://dx.doi.org/10.1007/978-3-540-69830-2_3 db/conf/ewsn/ewsn2007.html#CicirielloMP07