A. DAVOODNIA, M. BAKAVOLI, M. KHASHI, R. MOLOUDI, and N. TAVAKOLI-HOSEINI, “Synthesis of Pyrrolo[2,3-d]pyrimidin-4-ones(7-deazapurines) Under Solvent- and Catalyst-Free Conditions”, ajc, vol. 22, no. 6, pp. 4625–4628, May 2010.