Michalis Sfakakis Sarantos Kapidakis Semantic Based Substitution of Unsupported Access Points in the Library Meta-search Environments. 296-307 2008 ECDL http://dx.doi.org/10.1007/978-3-540-87599-4_32 conf/ercimdl/2008 db/conf/ercimdl/ecdl2008.html#SfakakisK08