H. A. Alhazmi, G. Manoharan, M. Al Bratty, and S. A. Javed, “Quantitative determination of clobetasone butyrate in bulk and cream formulation by a validated stability-indicating reversed-phase HPLC method”, Eur. J. Chem., vol. 9, no. 2, pp. 92–98, Jun. 2018.