M. Domeika, A. Savicheva, E. Sokolovskiy, R. Ballard, und M. Unemo. Euro Surveillance: Bulletin Européen Sur Les Maladies Transmissibles = European Communicable Disease Bulletin, 12 (12):
E071206.3(Dezember 2007)PMID: 18067849.
C. Walker, und H. Wiesenfeld. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, (April 2007)PMID: 17342664.