Automated Generation of an Historic 4D City Model of Hamburg and Its Visualisation with the GE Engine. - Thomas P. Kersten; Friedrich Keller; Jerome Saenger; Jochen Schiewe (EuroMed, 2012)

Calibration of Smartphones for the use in indoor navigation. - Friedrich Keller; Thomas Willemsen; Harald Sternberg (IPIN, 2012)

Multi-Sensor Platform for Indoor Mobile Mapping: System Calibration and Using a Total Station for Indoor Applications. - Friedrich Keller; Harald Sternberg (Remote. Sens., 2013)

Concept for building a smartphone based indoor localization system. - Thomas Willemsen; Friedrich Keller; Harald Sternberg (FUSION, 2014)

Museum of the moment: A cooperation project between metropolitan culture and geomatics. - Thomas Willemsen; Friedrich Keller; Stefanie Lorey; Harald Sternberg (IPIN, 2014)

Concept for building a MEMS based indoor localization system. - Thomas Willemsen; Friedrich Keller; Harald Sternberg (IPIN, 2014)

A topological approach with MEMS in smartphones based on routing-graph. - Thomas Willemsen; Friedrich Keller; Harald Sternberg (IPIN, 2015)

Development of a step counter based on artificial neural networks. - Jan Kupke; Thomas Willemsen; Friedrich Keller; Harald Sternberg (J. Locat. Based Serv., 2016)

Asymmetric-Partition Replication for Highly Scalable Distributed Transaction Processing in Practice. - Juchang Lee; Hyejeong Lee; Seongyun Ko; Kyu Hwan Kim; Mihnea Andrei; Friedrich Keller; Wook-Shin Han (Proc. VLDB Endow., 2020)