K. Kaier, C. Hagist, U. Frank, A. Conrad, и E. Meyer. Infection Control and Hospital Epidemiology: The Official Journal of the Society of Hospital Epidemiologists of America, 30 (4):
346--353(апреля 2009)PMID: 19236282.
P. Gastmeier, D. Sohr, C. Geffers, M. Behnke, и H. Rüden. Infection Control and Hospital Epidemiology: The Official Journal of the Society of Hospital Epidemiologists of America, 28 (4):
466--72(апреля 2007)PMID: 17385154.