@article{MRM11, author = {Leonardo A. Martucci and Sebastian Ries and Max M\"{u}hlh\"{a}user}, title = {{Sybil-Free Pseudonyms, Privacy and Trust: Identity Management in the Internet of Services}}, journal = {Journal of Information Processing}, volume = {19}, month = {Jul}, year = {2011}, issn = {1882-6652}, pages = {317--331}, publisher = {Information Processing Society of Japan}, address = {Tokyo, Japan} }