@CONFERENCE\{IMM2005-04091, author = "E. Gray and C. D. Jensen and P. {O'}Connell and S. Weber and J. Seigneur and Y. Chen", title = "Trust Evolution Policies for Security in Collaborative Ad Hoc Applications", year = "2005", month = "sep", booktitle = "Proceedings of the 1st International Workshop on Security and Trust Management", volume = "", series = "", editor = "", publisher = "", organization = "", address = "Milan, Italy", url = "http://www2.compute.dtu.dk/pubdb/pubs/4091-full.html" }