Jelena Isacenkova, Davide Balzarotti. Measurement and evaluation of a real world deployment of a challenge-response spam filter. In Patrick Thiran, Walter Willinger, editors, Proceedings of the 11th ACM SIGCOMM Conference on Internet Measurement, IMC '11, Berlin, Germany, November 2-, 2011. pages 413-426, ACM, 2011. [doi]
Abstract is missing.