Lowalekar, Rohit, and Lalit Singh Chauhan. “APPLICATION OF DESIGN OF EXPERIMENTS TO OPTIMIZE GASTRO RETENTIVE DRUG DELIVERY SYSTEMS FOR CIPROFLOXACIN HCL AND METRONIDAZOLE”. Asian Journal of Pharmaceutical Research and Development, vol. 4, no. 3, May 2016, pp. 1-9, https://ajprd.com/index.php/journal/article/view/283.