Alexander Moshchuk Tanya Bragin Steven D. Gribble Henry M. Levy A Crawler-based Study of Spyware in the Web. 2006 conf/ndss/2006 NDSS http://www.isoc.org/isoc/conferences/ndss/06/proceedings/papers/spycrawler.pdf db/conf/ndss/ndss2006.html#MoshchukBGL06