Anonymous User Tracking for Location-Based Community Services. - Peter Ruppel; Georg Treu; Axel Küpper; Claudia Linnhoff-Popien (LoCA, 2006)

Combining GPS and GSM Cell-ID positioning for Proactive Location-based Services. - Nico Deblauwe; Peter Ruppel (MobiQuitous, 2007)

Adaptive and Fault-Tolerant Service Composition in Peer-to-Peer Systems. - Vivian Prinz; Florian Fuchs 001; Peter Ruppel; Christoph Gerdes; Alan Southall (DAIS, 2008)

Efficient indoor proximity and separation detection for location fingerprinting. - Mikkel Baun Kjærgaard; Georg Treu; Peter Ruppel; Axel Küpper (MOBILWARE, 2008)

Indoor Navigation on Distributed Stationary Display Systems. - Peter Ruppel; Florian Gschwandtner; Corina Kim Schindhelm; Claudia Linnhoff-Popien (COMPSAC (1), 2009)

Spontaneous and Privacy-friendly Mobile Indoor Routing and Navigation. - Peter Ruppel; Florian Gschwandtner (GI Jahrestagung, 2009)

geoXmart - A Marketplace for Geofence-Based Mobile Services. - Ulrich Bareth; Axel Küpper; Peter Ruppel (COMPSAC, 2010)

BIGML: A Location Model with Individual Waypoint Graphs for Indoor Location-based Services. - Moritz Kessel; Peter Ruppel; Florian Gschwandtner (Prax. Inf.verarb. Kommun., 2010)

Umgebungsmodelle und Navigationsdaten für ortsbezogene Dienste in Gebäuden. - Peter Ruppel (2011)

X-centric positioning: A combination of device-centric and multi-rat network-centric positioning approaches in NGN. - Mohamed Salem; Peter Ruppel; Ulrich Bareth; Axel Küpper (GLOBECOM Workshops, 2012)

Geocookie: A Space-Efficient Representation of Geographic Location Sets. - Peter Ruppel; Axel Küpper (J. Inf. Process., 2014)

Location Analytics as a Service: Providing Insights for Heterogeneous Spatiotemporal Data. - Bersant Deva; Peter Ruppel (ICWS, 2015)

A-BIRCH: Automatic Threshold Estimation for the BIRCH Clustering Algorithm. - Boris Lorbeer; Ana Kosareva; Bersant Deva; Dzenan Softic; Peter Ruppel; Axel Küpper (INNS Conference on Big Data, 2016)

Macroscopic Patterns in Sparse Location Data: Identifying Mobility Prototypes. - Bianca Katharina Lüders; Peter Ruppel (BigDataService, 2018)

Variations on the Clustering Algorithm BIRCH. - Boris Lorbeer; Ana Kosareva; Bersant Deva; Dzenan Softic; Peter Ruppel; Axel Küpper (Big Data Res., 2018)

Anomaly Detection with HMM Gauge Likelihood Analysis. - Boris Lorbeer; Tanja Deutsch; Peter Ruppel; Axel Küpper (BigDataService, 2019)

Process Mining for Decentralized Applications. - Marcel Müller; Peter Ruppel (DAPPCON, 2019)

DeCoCo: Blockchain-based Decentralized Compensation of Digital Content Purchases. - Marcel Müller; Jacek Aleksander Janczura; Peter Ruppel (BRAINS, 2020)

A Taxonomy for Distributed Ledger Analytics. - Friedhelm Victor; Peter Ruppel; Axel Küpper (Computer, 2021)