Dr. M.R. Jayapal, et al. “Synthesis and Characterization of 2, 4-Dihydroxy Substitted Chalcones Using PEG-400 As a Recyclable Solvent”. Global Journal of Science Frontier Research, vol. 10, no. 6, Mar. 2010, p. -, https://journalofscience.org/index.php/GJSFR/article/view/184.