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"PQL: An Extended Pictorial Query Language for Querying Geographical ..."
Elaheh Pourabbas, Maurizio Rafanelli (1999)
- Elaheh Pourabbas, Maurizio Rafanelli:
PQL: An Extended Pictorial Query Language for Querying Geographical Databases Using Positional and OLAP Operators. ACM-GIS 1999: 165-166
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