Some classes of multilevel relational structures
PODS '86 Proceedings of the fifth ACM SIGACT-SIGMOD symposium on Principles of database systems
On the expressive power of the extended relational algebra for the unnormalized relational model
PODS '87 Proceedings of the sixth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Extended algebra and calculus for nested relational databases
ACM Transactions on Database Systems (TODS)
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VLDB '85 Proceedings of the 11th international conference on Very Large Data Bases - Volume 11
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