Tatapudi, H.K. et al. 2026. An optimized Box-Behnken design RP-HPLC method for the quantification of Umiclinidinium Bromide and Vilanterol Trifenate in inhalation powder. Drug Analytical Research. 8, 1 (Mar. 2026), 23–32. DOI:https://doi.org/10.22456/2527-2616.138200.