Xavier Granier Michael Goesele Wolfgang Heidrich Hans-Peter Seidel Interactive Visualization of Complex Real-World Light Sources. 59-66 2003 conf/pg/2003 Pacific Conference on Computer Graphics and Applications http://csdl.computer.org/comp/proceedings/pg/2003/2028/00/20280059abs.htm db/conf/pg/pg2003.html#GranierGHS03