1. An object-oriented model for intelligent query processing in geographical databases;Adam,1992
2. Extending a DBMS with spatial operations;Aref,1991
3. Comparison of approximations of complex objects used for approximation-based query processing in spatial database systems;Brinkoff,1993
4. Multi-step processing of spatial join;Brinkhoff,1994
5. Composite regions in topological queries;Clementiti;Information Systems,1995