Keiji Izaki Katsuya Tanaka Makoto Takizawa 0001 Information Flow Control among Objects in Role-Based Access Control Model. 299-308 2001 conf/dexa/2001 DEXA https://doi.org/10.1007/3-540-44759-8_30 db/conf/dexa/dexa2001.html#IzakiTT01