"Linkable Ring Signatures: Security Models and New Schemes" by Joseph K. Liu and Duncan S. Wong - Computational Science and Its Applications–ICCSA 2005 http://link.springer.com/chapter/10.1007%2F11424826_65
"Linkable Ring Signatures: Security Models and New Schemes" by Joseph K. Liu and Duncan S. Wong - Computational Science and Its Applications–ICCSA 2005 http://link.springer.com/chapter/10.1007%2F11424826_65