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Raul E. Piña-Aguilar; Janet Lopez-Saucedo; Richard Sheffield; Lilia I. Ruiz-Galaz; Jose de J. Barroso-Padilla; Antonio Gutiérrez-Gutiérrez (2009). "Revival of extinct species using nuclear transfer: hope for the mammoth, true for the Pyrenean ibex, but is it time for "conservation cloning"?". Cloning and Stem Cells. 11 (3): 341–346. doi:10.1089/clo.2009.0026. PMID19594389.