Christoph Stamm Stephan Eidenbenz Michael Beck Peter Stucki Peter Widmayer A Prototype System for Light Propagation in Terrains. 103- 1998 conf/cgi/1998 Computer Graphics International http://csdl.computer.org/comp/proceedings/cgi/1998/8445/00/84450103abs.htm db/conf/cgi/cgi1998.html#StammEBSW98