“Phenotypic detection of extended spectrum ?-lactamase and AmpC ?-lactamase in urinary isolates of Escherichia coli at a tertiary care referral hospital in Northeast India”, J Coll Med Sci-Nepal, vol. 8, no. 3, pp. 22–29, Sep. 2013, doi: 10.3126/jcmsn.v8i3.8682.