@Article {ddps.ic,
    author = {E. Damiani and S. {De Capitani di Vimercati} and S. Paraboschi and P. Samarati},
    title = {Controlling Access to {XML} Documents},
    journal = {IEEE Internet Computing},
    volume = {5},
    number = {6},
    month = {November/December},
    year = {2001}
}