QURSHEED SULTANA, et al. “DETECTION OF EXTENDED-SPECTRUM BETA-LACTAMASE PRODUCTION IN GRAM NEGATIVE BACTERIA FROM DIFFERENT CLINICAL ISOLATES”. International Journal of Pharma and Bio Sciences, vol. 5, no. 2, June 2014, pp. 618-26, https://ijpbs.net/index.php/journal/article/view/3579.