2025 · Oliva, Hans, Ehlen, Sebastian, et al. · Publication Server of Bonn-Rhein-Sieg University of Applied Sciences (Bonn-Rhein-Sieg University of Applied Sciences)
2025 · Löcherbach, Peter, Oliva, Hans, et al. · Publication Server of Bonn-Rhein-Sieg University of Applied Sciences (Bonn-Rhein-Sieg University of Applied Sciences)