N. Reddy Vuyyuru, A. Malleswara Reddy, B. Ramadevi, Y. Ravindra Kumar, and B. Janaki Durga Prasad, “A Simple, Specific, Mass Compatible and Validated Gas Chromatographic Method for the Estimation of Piperidine-3-amine Content in Linagliptin Finished and Stability Samples without Derivatization”, ajc, vol. 32, no. 10, pp. 2567–2572, Sep. 2020.