D. Livermore. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 34 (5):
634--40(March 2002)PMID: 11823954.
A. Sullivan, J. Wigginton, and D. Kirschner. Proceedings of the National Academy of Sciences of the United States of America, 98 (18):
10214--10219(August 2001)PMID: 11517319.