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Menor-Salván C, Ruiz-Bermejo DM, Guzmán MI, Osuna-Esteban S, Veintemillas-Verdaguer S (2007). “Synthesis of pyrimidines and triazines in ice: implications for the prebiotic chemistry of nucleobases”. Chemistry. 15 (17): 4411–8. doi:10.1002/chem.200802656. PMID19288488.