M. A. M. Hegazy, M. A. Al-Ghobashy, B. M. Eltanany, and F. I. Khattab, “Spectral resolution and simultaneous determination of oxymetazoline hydrochloride and sodium cromoglycate by derivative and ratio-based spectrophotometric methods”, Eur. J. Chem., vol. 6, no. 3, pp. 319–324, Sep. 2015.