Anirudh Ramachandran Nick Feamster David Dagon Detecting Botnet Membership with DNSBL Counterintelligence. 131-142 2008 Botnet Detection http://dx.doi.org/10.1007/978-0-387-68768-1_7 series/ais/36 db/series/ais/ais36.html#RamachandranFD08