Lee, K.J., et al. “Optimization of the Conditions for the Analysis of Curcumin and a Related Compound in Curcuma Longa With Mobile-Phase Composition and Column Temperature via RP-HPLC”. Asian Journal of Chemistry, vol. 25, no. 11, June 2013, pp. 6306-10, doi:10.14233/ajchem.2013.14471.