V. Darugar, M. Vakili, S. F. Tayyari, F. S. Kamounah, and R. Afzali, “Application of Hammett equation to intramolecular hydrogen bond strength in para-substituted phenyl ring of trifluorobenzoylacetone and 1-aryl-1,3-diketone malonates”, Eur. J. Chem., vol. 9, no. 3, pp. 213–221, Sep. 2018.