@incollection{MaaserOrtmannLangendoerfer, author = {Maaser, Michael and Ortmann, Steffen and Langend{\"o}rfer, Peter}, title = {The Privacy Advocate: Assertion of Privacy by Personalised Contracts}, language = {en} } @incollection{OrtmannMaaserLangendoerfer, author = {Ortmann, Steffen and Maaser, Michael and Langend{\"o}rfer, Peter}, title = {High Level Definition of Event-based Applications for Pervasive Systems}, language = {en} } @incollection{OrtmannLangendoerfer, author = {Ortmann, Steffen and Langend{\"o}rfer, Peter}, title = {Social Networking and Privacy, a Contradiction?}, language = {en} }