International Conference on Entity-Relationship Approach.International Conference on Entity-Relationship Approach (8th : 1989 : Toronto, Canada)：Entity-relationship approach to database design and querying : proceedings.NHPC,1990.
International Conference on Entity-Relationship Approach (8th : 1989 : Toronto, Canada)：Entity-relationship approach to database design and querying : proceedings
International Conference on Entity-Relationship Approach.NHPC,1990.
