Michele Flammini Gianpiero Monaco Luca Moscardelli Hadas Shachnai Mordechai Shalom Tami Tamir Shmuel Zaks Minimizing total busy time in parallel scheduling with application to optical networks. 1-12 2009 IPDPS http://dx.doi.org/10.1109/IPDPS.2009.5161017 conf/ipps/2009 db/conf/ipps/ipdps2009.html#FlamminiMMSSTZ09