P. Gastmeier, D. Sohr, C. Geffers, M. Behnke, and H. Rüden. Infection Control and Hospital Epidemiology: The Official Journal of the Society of Hospital Epidemiologists of America, 28 (4):
466--72(April 2007)PMID: 17385154.
T. Linner, M. Kranz, L. Roalter, and T. Bock. Proceedings of the 2010 Sixth International Conference on Intelligent Environments, page 295--300. Washington, DC, USA, IEEE Computer Society, (July 2010)