db/conf/gis/GordilloBN97.html Silvia E. Gordillo Federico Balaguer Fernando Das Neves Generating the Architecture of GIS Applications with Design Patterns. 30-34 GIS1997/P030.pdf 1997 conf/gis/97 ACM-GIS http://doi.acm.org/10.1145/267825.267835 db/conf/gis/gis97.html#GordilloBN97