1. European Directorate for the Quality of Medicines, 6th edn. (Council of Europe (COE), 2008)
2. A. Goel, S. Saini, V. Chowdhry, S.A. Haider, R.K. Singh, Int. J. Pharm. 2, 502 (2011)
3. D. Farthing, D. Sics, I. Fakhry, D.L. Waiters, E.A. Cefali, G. Allan, Biomed. Chromatogr. 8, 251 (1994)
4. H.R.N. Salgado, M. de Menezes, M.P.B. Storti, Acta Farm. Bonaer. 24(2), 246 (2005)
5. A.A. Smith, R. Manavalan, K. Kannan, N. Rajendiran, Int. J. PharmTech Res. 1(2), 360 (2009)