Haritha G, Vijey Aanandhi M, and Shanmugasundaram P, “A Quality by Design (QbD) Based Method Development and Validation of a High-Performance Liquid Chromatography for the Simultaneous Estimation of Metformin and Ertugliflozin”, Int. J. Res. Pharm. Sci., vol. 12, no. 3, pp. 1709–1717, Jul. 2021.