From Object-Relational to Federated Databases. - Nelson Mendonça Mattos; Jim Kleewein; Mary Tork Roth; Kathy Zeidenstein (BTW, 1999)

SQL and Management of External Data. - Jim Melton; Jan-Eike Michels; Vanja Josifovski; Krishna G. Kulkarni; Peter M. Schwarz; Kathy Zeidenstein (SIGMOD Rec., 2001)