[1]
R. I. El-Bagary, E. F. Elkady, and B. M. Ayoub, “Development and validation of a reversed phase liquid chromatographic method for the determination of three Gliptins and Metformin in the presence of Metformin impurity (1-cyanoguanidine)”, Eur. J. Chem., vol. 4, no. 4, pp. 444–449, Dec. 2013.