Addressing Spam E-Mail Using Hashcast. - Kevin Curran; John Stephen Honan (Int. J. Bus. Data Commun. Netw., 2005)

Eliminating the Volume of Spam E-Mails Using a Hashcash-Based Solution. - Kevin Curran; John Stephen Honan (Inf. Secur. J. A Glob. Perspect., 2006)