Sattar, A., Faqir, F., Abbasi, S. A., Fraz, A., & Hussain, Z. (2009). CHANGING TRENDS IN FREQUENCY OF EXTENDED SPECTRUM BETA LACTAMASE PRODUCING GRAM NEGATIVE BACILLI IN INTENSIVE CARE UNITS OF A TERTIARY CARE HOSPITAL: Changing trends in Frequency of Expended Spectrum Beta Lactamase. Pakistan Armed Forces Medical Journal, 59(3), 271-74. https://www.pafmj.org/PAFMJ/article/view/1715