JAYASHREE, B.S., et al. “Microwave Assisted Synthesis of Substituted Coumarinyl Chalcones As Reaction Intermediates for Biologically Important Coumarinyl Heterocycles”. Asian Journal of Chemistry, vol. 20, no. 1, Mar. 2010, pp. 1-7, https://asianpubs.org/index.php/ajchem/article/view/19318.