T. Ali\, S. Yehia, und M. El-Didamony. International Journal of Civil, Mechanical and Energy Science (IJCMES) (ISSN-2455-5304), 3 (3):
154-165(Mai 2017)
R. Tsang, M. Sill, S. Skinner, D. Law, J. Zhou, und J. Wylie. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 44 (12):
1611--4(Juni 2007)PMID: 17516405.