Rema Ananthanarayanan Mukesh K. Mohania Ajay Gupta 0004 Management of Conflicting Obligations in Self-Protecting Policy-Based Systems. 274-285 2005 conf/icac/2005 ICAC http://doi.ieeecomputersociety.org/10.1109/ICAC.2005.38 db/conf/icac/icac2005.html#AnanthanarayananMG05