Bhatti, H.A. et al. 2015. Synthesis, characterization of flavone, isoflavone, and 2,3-dihydrobenzofuran-3-carboxylate and density functional theory studies. European Journal of Chemistry. 6, 3 (Sep. 2015), 305–313. DOI:https://doi.org/10.5155/eurjchem.6.3.305-313.1268.