@Article {cdd.tkde01,
    author = {S. Castano and V. De Antonellis and S. {De Capitani di Vimercati}},
    title = {Global Viewing of Heterogeneous Data Sources},
    journal = {IEEE Transactions on Knowledge and Data Engineering (TKDE)},
    volume = {13},
    number = {2},
    month = {March/April},
    year = {2001}
}