Chang-Joo Moon Woojin Paik Young-Gab Kim JuHum Kwon The Conflict Detection Between Permission Assignment Constraints in Role-Based Access Control. 265-278 2005 conf/cisc/2005 CISC http://dx.doi.org/10.1007/11599548_23 db/conf/cisc/cisc2005.html#MoonPKK05