Dimitrios Kourtesis Ervin Ramollari Dimitris Dranidis Iraklis Paraskakis Discovery and Selection of Certified Web Services Through Registry-Based Testing and Verification. 473-482 2008 Virtual Enterprises and Collaborative Networks http://dx.doi.org/10.1007/978-0-387-84837-2_49 conf/ifip5-5/2008 db/conf/ifip5-5/ifip5-5-2008.html#KourtesisRDP08