Towards a visual query language for an object oriented geographical information system
1994 ◽
Vol 5
(2)
◽
pp. 113-132
◽
1989 ◽
Vol 3
(1)
◽
pp. 51-57
◽
1999 ◽
Vol 13
(5)
◽
pp. 475-498
◽
1988 ◽
Vol 2
(2)
◽
pp. 101-110
◽
1993 ◽
Vol 4
(4)
◽
pp. 383-401
◽
1990 ◽
pp. 275-280
◽
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