A system of types and operators for handling vague spatial objects.

Arta Dilo Rolf A. de By Alfred Stein A system of types and operators for handling vague spatial objects. 397-426 2007 21 International Journal of Geographical Information Science 4 http://dx.doi.org/10.1080/13658810601037096 db/journals/gis/gis21.html#DiloBS07