Vincenzo Del Fatto Robert Laurini Karla Lopez Rosalva Loreto Françoise Milleret-Raffort Monica Sebillo David Sol-Martinez Giuliana Vitiello Potentialities of Chorems as Visual Summaries of Geographic Databases Contents. 537-548 2007 conf/visual/2007 VISUAL http://dx.doi.org/10.1007/978-3-540-76414-4_52 db/conf/visual/visual2007.html#FattoLLLMSSV07