@conference {DBLP:conf/diau/PfitzmannK00, title = {Anonymity, Unobservability, and Pseudonymity - A Proposal for Terminology}, booktitle = {Workshop on Design Issues in Anonymity and Unobservability}, year = {2000}, pages = {1-9}, author = {Andreas Pfitzmann and Marit K{\"o}hntopp} }