“Validation of In-vitro Deposition of Emitted Dose Method for Simultaneous Estimation of Formoterol Fumarate and Glycopyrrolate in combined Dry Powder Inhaler Aerosol Pharmaceutical Dosage Form”, Int. J. Pharm. Sci. Drug Res., vol. 12, no. 5, pp. 501–508, Sep. 2020, doi: 10.25004/IJPSDR.2020.120511.