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Nuevo, M.; Milam, S. N.; Sandford, S. A.; Elsila, J. E.; Dworkin, J. P. (2009). "Formation of uracil from the ultraviolet photo-irradiation of pyrimidine in pure H2O ices". Astrobiology. 9 (7): 683–695. Bibcode:2009AsBio...9..683N. doi:10.1089/ast.2008.0324. PMID19778279.
Nuevo, M.; Milam, S. N.; Sandford, S. A.; Elsila, J. E.; Dworkin, J. P. (2009). "Formation of uracil from the ultraviolet photo-irradiation of pyrimidine in pure H2O ices". Astrobiology. 9 (7): 683–695. Bibcode:2009AsBio...9..683N. doi:10.1089/ast.2008.0324. PMID19778279.