@Book {efp.stm2006,
    editor = {S. Etalle and P. Samarati},
    booktitle = {Proc. of the Second International Workshop on Security and Trust Management (STM 2006)},
    publisher = {Elsevier},
    address = {Hamburg, Germany},
    number = {179},
    series = {Electronic Notes in Theoretical Computer Science},
    month = {September},
    day = {20-21},
    year = {2006}
}