S. Huang, и R. Platt. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 36 (3):
281--285(февраля 2003)PMID: 12539068.
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.