Vincenzo Del Fatto Luca Paolino Fabio Pittarello A usability-driven approach to the development of a 3D web-GIS environment. 280-314 2007 18 J. Vis. Lang. Comput. 3 http://dx.doi.org/10.1016/j.jvlc.2007.02.007 db/journals/vlc/vlc18.html#FattoPP07