M. Dworkin, L. Park, und S. Borchardt. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 44 (6):
810--6(März 2007)PMID: 17304452.
W. Organization.. 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, 51 (51):
385--386(1976)PMID: 1958468.