Gennady L. Andrienko Natalia V. Andrienko Piotr Jankowski Daniel A. Keim Menno-Jan Kraak Alan M. MacEachren Stefan Wrobel Geovisual analytics for spatial decision support: Setting the research agenda. 839-857 2007 21 International Journal of Geographical Information Science 8 http://dx.doi.org/10.1080/13658810701349011 db/journals/gis/gis21.html#AndrienkoAJKKMW07