Cássio Ditzel Kropiwiec Edgard Jamhour Manoel Camillo Penna Guy Pujolle Multi-constraint Security Policies for Delegated Firewall Administration. 123-135 2008 DSOM http://dx.doi.org/10.1007/978-3-540-87353-2_10 conf/dsom/2008 db/conf/dsom/dsom2008.html#KropiwiecJPP08