Lotfy, H. M., Hegazy, M. A. M., & Abdel-Gawad, S. A. N. (2013). Simultaneous determination of Simvastatin and Sitagliptin in tablets by new univariate spectrophotometric and multivariate factor based methods. European Journal of Chemistry, 4(4), 414–421. https://doi.org/10.5155/eurjchem.4.4.414-421.829