@InProceedings{conf/itrust/AgudoLM05,<br>
  title     = {Graphical Representation of Authorization Policies for Weighted Credentials.},<br>
  author =	"Isaac Agudo and Javier Lopez and Jos{\'e} A. Montenegro",<br>
  booktitle =	"ACISP",<br>
  booktitle =	{Information Security and Privacy, 11th Australasian Conference,
               ACISP 2006, Melbourne, Australia, July 3-5, 2006, Proceedings},<br>
  publisher =	"Springer",<br>
  year = 	"2006",<br>
  volume =	"4058",<br>
  editor =   {Lynn Margaret Batten and Reihaneh Safavi-Naini},<br>
  pages =	"383--394",<br>
  series =	"Lecture Notes in Computer Science",<br>
}