A. Syam Prasad Reddy, K. Shantan Kumar Reddy, Sukumar Nandi, Akkina Naresh Gona Reddy, Paparaju Venkateswarlu. “Process Related Impurities In Anti-Diabetic Drug Linagliptin”. Journal of Pharmaceutical Research and Opinion, vol. 5, no. 5, May 2015, doi:10.15520/jpro.2015.vol5.iss5.15.