Laura Chiticariu Mauricio A. Hernández Phokion G. Kolaitis Lucian Popa Semi-Automatic Schema Integration in Clio. 1326-1329 2007 conf/vldb/2007 VLDB http://www.vldb.org/conf/2007/papers/demo/p1326-chiticariu.pdf db/conf/vldb/vldb2007.html#ChiticariuHPK07