A. Syam Prasad Reddy, K. Shantan Kumar Reddy, S.N.A.N.G.R.P.V. 2015. Process Related Impurities In Anti-Diabetic Drug Linagliptin. Journal of Pharmaceutical Research and Opinion. 5, 5 (May 2015). DOI:https://doi.org/10.15520/jpro.2015.vol5.iss5.15.