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\i Defending Against Denial-of-Service Attacks with Puzzle Auctions\i0  In \i 2003 IEEE Symposium on Security and Privacy\i0 ., 2003.\par \par Reiter, Michael K., and Aviel D. Rubin. "Anonymous Web Transactions with Crowds." \i Communications of the ACM\i0  42, no. 2 (1999): 32-38.\par \par Reiter, Michael K., and Aviel D. Rubin. "Crowds: Anonymity for Web Transactions." \i ACM Transactions on Information and System Security\i0  1, no. 1 (1998): 66-92.\par \par }