S. Shehab, N. Keller, A. Barkay, L. Leitner, A. Leventhal, и C. Block. European Journal of Clinical Microbiology & Infectious Diseases: Official Publication of the European Society of Clinical Microbiology, 17 (11):
749--53(ноября 1998)PMID: 9923513.
WHO. Relevé Épidémiologique Hebdomadaire / Section D'hygiène Du Secrétariat De La Société Des Nations = Weekly Epidemiological Record / Health Section of the Secretariat of the League of Nations, 81 (13):
119--120(марта 2006)PMID: 16673512.