Ullah, M. B., M. R. Karim, M. S. Alam, M. R. Hassan, M. A. Bhuiyan, and M. S. Rana. “Formulation and In Vitro Evaluation of Unfolding Type Expandable Gastroretentive Film of Enalapril Maleate”. Bangladesh Pharmaceutical Journal, vol. 20, no. 2, Aug. 2018, pp. 148-56, doi:10.3329/bpj.v20i2.37868.