@Book {jsm-stm2012,
    editor = {A. Josang and P. Samarati and M. Petrocchi},
    booktitle = {Proc. of the 8th International Workshop on Security and Trust Management (STM 2012)},
    publisher = {Springer},
    number = {7783},
    series = {LNCS},
    year = {2012}
}