A. Salapaka, K. Babu Bonige, K. C. Reddy, H. Kumar Sharma, and U. Kumar Ray, “A New Stability Indicating Reverse Phase HPLC Method for the Determination of Related Substances of DPP4 Inhibitor Drug: Linagliptin”, ajc, vol. 34, no. 10, pp. 2587–2592, Sep. 2022.