Thahera, P.D., Ashok, M., Latha, K., Shailaja, T., Nyamathulla, S. and Uhumwangho, M.U. 2012. Formulation and evaluation of Norfloxacin gastro retentive drug delivery systems using natural polymers. International Current Pharmaceutical Journal. 1, 7 (Jun. 2012), 155–164. DOI:https://doi.org/10.3329/icpj.v1i7.10809.