Jahan, L., R. Ferdaus, S. M. Shaheen, M. Z. Sultan, and M. A. Mazid. “<i>In vitro</I> Transdermal Delivery of Metformin from a HPMC/ PVA Based TDS-Patch at Different PH”. Journal of Scientific Research, vol. 3, no. 3, Aug. 2011, pp. 651-7, doi:10.3329/jsr.v3i3.7422.