TY - JOUR A1 - Langendörfer, Peter A1 - Maye, Oliver A1 - Dyka, Zoya A1 - Sorge, R. A1 - Winkler, R. A1 - Kraemer, Rolf T1 - Plasma - A Middleware for Location-Based Services: Design, Implementations and Lessons Learned Y1 - 2011 UR - https://opus4.kobv.de/opus4-UBICO/frontdoor/index/index/docId/5965 ER -