P. Veugelers, und A. Fitzgerald. CMAJ: Canadian Medical Association Journal = Journal De l'Association Medicale Canadienne, 173 (6):
607--613(September 2005)PMID: 16157724.
P. Gastmeier, D. Sohr, C. Geffers, M. Behnke, und 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.
P. Stefanoff, M. Rosinska, G. Karczewski, und A. Zielinski. Euro Surveillance: Bulletin Européen Sur Les Maladies Transmissibles = European Communicable Disease Bulletin, (März 2008)PMID: 18445440.