Orland Hoeber Garnett Carl Wilson Simon Harding René Enguehard Rodolphe Devillers Visually representing geo-temporal differences. 229-230 2010 IEEE VAST http://dx.doi.org/10.1109/VAST.2010.5652951 conf/ieeevast/2010 db/conf/ieeevast/ieeevast2010.html#HoeberWHED10