Michael Hitchens Judy Kay Bob Kummerfeld Ajay Brar Secure Identity Management for Pseudo-Anonymous Service Access. 48-55 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3450&spage=48 2005 conf/spc/2005 SPC db/conf/spc/spc2005.html#HitchensKKB05