Tirthankar Lahiri Serge Abiteboul Jennifer Widom Ozone: Integrating Structured and Semistructured Data. 297-323 http://dx.doi.org/10.1007/3-540-44543-9_18 1999 conf/dbpl/1999 DBPL db/conf/dbpl/dbpl1999.html#LahiriAW99