Panwar, M. M. S. “Development and Characterization of Sustain Release Gastro Retentive Floating Microsphere of Diltiazem Hydrochloride for the Treatment of Hypertension”. Asian Journal of Pharmaceutics (AJP), vol. 9, no. 2, Apr. 2015, pp. 107-12, doi:10.22377/ajp.v9i2.439.