Holguín, G., F. Cuesta, R. Archbold, M. Restrepo, S. Parra, L. Peña, B. Montoya, J. C. Ríos, V. E. Toro, and A. Ruiz. “Bioavalaibility and Pharmacokinetic Comparison of Two Formulations of Metformin 850 Mg Tablets in Healthy Colombian Volunteers”. Colombia Medica, vol. 42, no. 1, Apr. 2011, pp. 81-87, doi:10.25100/cm.v42i1.754.