@InBook{Massonet:GridTrust:MIT:2008,
      AUTHOR = {Massonet, Philippe and Arenas, Alvaro and Martinelli, Fabio and Mori, Paolo and Crispo, Bruno},
      TITLE = {GridTrust -- A Usage Control Based Trust and Security Framework for Service-Based Grids},
      YEAR = {2008},
      BOOKTITLE = {At your service: Service Engineering in the Information Society Technologies Program},
      EDITOR = {Di Nitto, E. and Sassen, A.-M. and Traverso, P. and Zwegers, A.},
      PUBLISHER = {MIT Press},
      CHAPTER = {16},
      KEYWORDS = {Trust and Security}
}