Keiji Izaki Katsuya Tanaka Makoto Takizawa 0001 Access Control Model in Object-Oriented Systems. 361-366 2000 conf/dbsec/2000 DBSec db/conf/dbsec/dbsec2000.html#IzakiTT00 https://doi.org/10.1007/0-306-47008-X_33