George Christodoulou Elias Koutsoupias Annamária Kovács Mechanism Design for Fractional Scheduling on Unrelated Machines. 40-52 2007 conf/icalp/2007 ICALP http://dx.doi.org/10.1007/978-3-540-73420-8_6 db/conf/icalp/icalp2007.html#ChristodoulouKK07