Triadic relationships in the context of services for animal companions
J. Rötzmeier-Keuper, J. Hendricks, N. Wünderlich, G. Schmitz, Journal of Business Research (2018) 295--303.

Quantitative myocardial perfusion PET combined with coronary anatomy derived from CT angiography: Validation of a new fusion and visualisation software
H. Fricke, A. Elsner, R. Weise, M. Bolte, J. van den Hoff, W. Burchert, G. Domik, E. Fricke, Zeitschrift Für Medizinische Physik 19 (2009) 182–188.