TY - CHAP A1 - Maaser, Michael A1 - Ortmann, Steffen A1 - Langendörfer, Peter T1 - The Privacy Advocate: Assertion of Privacy by Personalised Contracts Y1 - 2008 ER - TY - CHAP A1 - Ortmann, Steffen A1 - Maaser, Michael A1 - Langendörfer, Peter T1 - High Level Definition of Event-based Applications for Pervasive Systems Y1 - 2012 ER - TY - CHAP A1 - Ortmann, Steffen A1 - Langendörfer, Peter T1 - Social Networking and Privacy, a Contradiction? Y1 - 2012 ER -