K.Usha, E. Kumar, and DVR. Sai Gopal. 2013. “OCCURRENCE OF VARIOUS BETA-LACTAMASE PRODUCING GRAM NEGATIVE BACILLI IN THE HOSPITAL EFFLUENT”. Asian Journal of Pharmaceutical and Clinical Research 6 (7):42-46. https://journals.innovareacademics.in/index.php/ajpcr/article/view/85.