@InProceedings {dds.oak99,
    author = {S. Dawson and S. {De Capitani di Vimercati} and P. Samarati},
    booktitle = {Proc. of the 20th IEEE Symposium on Security and Privacy},
    title = {Specification and Enforcement of Classification and Inference Constraints},
    address = {Oakland, CA, USA},
    month = {May},
    year = {1999}
}