Eirinaios Michelakis Ion Androutsopoulos Georgios Paliouras Georgios Sakkis Panagiotis Stamatopoulos Filtron: A Learning-Based Anti-Spam Filter. 2004 conf/ceas/2004 CEAS http://www.ceas.cc/papers-2004/142.pdf db/conf/ceas/ceas2004.html#MichelakisAPSS04