Querying object-oriented databases
SIGMOD '92 Proceedings of the 1992 ACM SIGMOD international conference on Management of data
Towards a standard for SQL-based spatial query languages
SAC '92 Proceedings of the 1992 ACM/SIGAPP Symposium on Applied computing: technological challenges of the 1990's
ELFS: English language from SQL
ACM Transactions on Database Systems (TODS)
User defined topological predicates in database systems
Geoinformatica
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