Jan Christian Lang Thomas Widjaja Peter Buxmann Wolfgang Domschke Thomas Hess Optimizing the Supplier Selection and Service Portfolio of a SOA Service Integrator. 89 2008 conf/hicss/2008 HICSS http://doi.ieeecomputersociety.org/10.1109/HICSS.2008.338 db/conf/hicss/hicss2008.html#LangWBDH08