@InProceedings {s.aica94,
    author = {P. Samarati},
    booktitle = {Atti del Congresso Annuale AICA},
    title = {Multilevel Relational Databases: Issues and Solutions},
    address = {Palermo},
    pages = {1825-1847},
    month = {September},
    year = {1994}
}