K. Swetha, N. Jhancy laxmi bai and N. Sriram 2019. Formulation and evaluation of gastro-retentive drug delivery system of proponolol HCL. IJPAR JOURNAL. 8, 2 (May 2019), 218–226. DOI:https://doi.org/10.61096/ijpar.v8.iss2.2019.218-226.