K. Anstey, H. Mack, и N. Cherbuin. The American Journal of Geriatric Psychiatry: Official Journal of the American Association for Geriatric Psychiatry, 17 (7):
542--555(июля 2009)PMID: 19546653.
E. Tacconelli. Clinical Microbiology and Infection: The Official Publication of the European Society of Clinical Microbiology and Infectious Diseases, 14 (5):
407--10(мая 2008)PMID: 18190564.
P. Stefanoff, M. Rosinska, G. Karczewski, и A. Zielinski. Euro Surveillance: Bulletin Européen Sur Les Maladies Transmissibles = European Communicable Disease Bulletin, (марта 2008)PMID: 18445440.