O. Bilukha, und N. Rosenstein. MMWR. Recommendations and Reports: Morbidity and Mortality Weekly Report. Recommendations and Reports / Centers for Disease Control, 54 (RR-7):
1--21(Mai 2005)PMID: 15917737.
M. Breukels, E. van der Zijde, M. van Tol, und G. Rijkers. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 34 (2):
191--7(Januar 2002)PMID: 11740707.