@Article {bsj.tkde97,
    author = {E. Bertino and P. Samarati and S. Jajodia},
    title = {An Extended Authorization Model for Relational Databases},
    journal = {IEEE Transactions on Knowledge and Data Engineering (TKDE)},
    volume = {9},
    number = {1},
    month = {January-February},
    year = {1997}
}