Graqula—A Visual Information-flow Query Language for a Geographical Information System
1993 ◽
Vol 4
(4)
◽
pp. 383-401
◽
1989 ◽
Vol 3
(1)
◽
pp. 51-57
◽
1990 ◽
pp. 275-280
◽
1994 ◽
Vol 5
(2)
◽
pp. 113-132
◽
2015 ◽
Vol 4
(1)
◽
pp. 1435-1448