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nih.gov
ncbi.nlm.nih.gov
Dubos J. «Louis Pasteur: Free Lance of Science, Gollancz. Quoted in Manchester K. L. (1995) Louis Pasteur (1822–1895)--chance and the prepared mind.». Trends Biotechnol, 13, 12, 1951, pàg. 511–515. DOI: 10.1016/S0167-7799(00)89014-9. PMID: 8595136.
«Why does Alaska have more botulism». Centers for Disease Control and Prevention (U.S. federal agency). Arxivat de l'original el 7 d’agost 2006. [Consulta: 18 juliol 2011].