Oliver Berthold Hannes Federrath Stefan Köpsell Web MIXes: A System for Anonymous and Unobservable Internet Access. 115-129 2000 conf/diau/2000 Workshop on Design Issues in Anonymity and Unobservability http://link.springer.de/link/service/series/0558/bibs/2009/20090115.htm db/conf/diau/diau2000.html#BertholdFK00