A grammar-based approach towards unifying hierarchical data models
SIGMOD '89 Proceedings of the 1989 ACM SIGMOD international conference on Management of data
A recursive algebra and query optimization for nested relations
SIGMOD '89 Proceedings of the 1989 ACM SIGMOD international conference on Management of data
Converting nested algebra expressions into flat algebra expressions
ACM Transactions on Database Systems (TODS)
Semantics for null extended nested relations
ACM Transactions on Database Systems (TODS)
Regular Article: The nested universal relation data model
Proceedings of the 30th IEEE symposium on Foundations of computer science
Deciding containment for queries with complex objects (extended abstract)
PODS '97 Proceedings of the sixteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
An Equational Chase for Path-Conjunctive Queries, Constraints, and Views
ICDT '99 Proceedings of the 7th International Conference on Database Theory
On Multisets in Database Systems
WMP '00 Proceedings of the Workshop on Multiset Processing: Multiset Processing, Mathematical, Computer Science, and Molecular Computing Points of View
Equivalence of nested queries with mixed semantics
Proceedings of the twenty-eighth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
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