K.Usha, E. Kumar, and D. S. Gopal. “OCCURRENCE OF VARIOUS BETA-LACTAMASE PRODUCING GRAM NEGATIVE BACILLI IN THE HOSPITAL EFFLUENT”. Asian Journal of Pharmaceutical and Clinical Research, vol. 6, no. 7, Aug. 2013, pp. 42-46, https://journals.innovareacademics.in/index.php/ajpcr/article/view/85.