Shashi K. Gadia Applicability of Temporal Data Models to Query Multilevel Security Databases: A Case Study. 238-256 1997 Temporal Databases, Dagstuhl db/conf/dagstuhl/dagstuhl-tdb97.html#Gadia97 http://link.springer.de/link/service/series/0558/bibs/1399/13990238.htm