SHASHANK , CHATURVEDI, et al. “APPROACHES TO INCREASE THE GASTRIC RESIDENCE TIME:FLOATING DRUG DELIVERY SYSTEMS- A REVIEW”. Asian Journal of Pharmaceutical and Clinical Research, vol. 6, no. 3, July 2013, pp. 1-9, https://www.journals.innovareacademics.in/index.php/ajpcr/article/view/52.