H. S. Khanfar, K. M. Bindayna, A. C. Senok, and G. A. Botta, “Extended spectrum beta-lactamases (ESBL) in Escherichia coli and Klebsiella pneumoniae: trends in the hospital and community settings”, J Infect Dev Ctries, vol. 3, no. 04, pp. 295–299, May 2009.