Schumacher, MichaelVan Pelt, TimConstantinescu, IonDe Oliveira E Sousa, AlexandreFaltings, Boi2006-12-132006-12-132006-12-13200710.1145/1244002.1244089https://infoscience.epfl.ch/handle/20.500.14299/238547WOS:000268215700074Federated directories of Semantic web servicestext::conference output::conference proceedings::conference paper