M. A. El-Apasery, S. M. Al-Mousawi, and M. H. Elnagdi, “Green methodologies in organic synthesis: Microwave assisted solvent- and catalyst-free synthesis of enaminones and their conversion into 1,3,5-trisubstituted benzenes as well as 3-aroyl-6-substituted pyridines”, Eur. J. Chem., vol. 2, no. 2, pp. 168–172, Jun. 2011.