@ARTICLE{robust-igpl,
   AUTHOR = "Thomas {\AA}gotnes and Wiebe van der Hoek and Michael Wooldridge",
   TITLE = "Robust Normative Systems and a Logic of Norm Compliance",
   JOURNAL = "Logic Journal of the Interest Group in Pure and Applied
                  Logics (IGPL)",
   YEAR = 2010,
   VOLUME = 18,
   NUMBER = 1,
   PAGES = "4--30"}