Zaghary, Wafaa Abdou, et al. “Utilization of UPLC-Tandem Mass Spectrometry for Quantitation of Colouring Matters in Dietary Formulation”. European Journal of Chemistry, vol. 10, no. 3, Sept. 2019, pp. 239-43, doi:10.5155/eurjchem.10.3.239-243.1786.