Cagdas Evren Gerede Oscar H. Ibarra Bala Ravikumar Jianwen Su Online and Minimum-Cost Ad Hoc Delegation in e-Service Composition. 103-112 2005 conf/IEEEscc/2005 IEEE SCC http://doi.ieeecomputersociety.org/10.1109/SCC.2005.69 db/conf/IEEEscc/scc2005.html#GeredeRS05