Chris Kenyon Giorgos Cheliotis Creating Services with Hard Guarantees from Cycle-Harvesting Systems. 224-231 2003 conf/ccgrid/2003 CCGRID http://csdl.computer.org/comp/proceedings/ccgrid/2003/1919/00/19190224abs.htm db/conf/ccgrid/ccgrid2003.html#KenyonC03