P. Wals, G. Deceuninck, {. Boucher, и M. Ouakki. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 46 (8):
e75--77(апреля 2008)PMID: 18444843.
R. Brooks, C. Woods, D. Benjamin, и N. Rosenstein. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 43 (1):
49--54(июля 2006)PMID: 16758417.