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Hiendleder, S.; K. Mainz; Y. Plante; H. Lewalski (March 2007). “Analysis of mitochondrial DNA indicates that domestic sheep are derived from two different ancestral maternal sources: no evidence for contributions from urial and argali sheep.”. 《The Journal of Heredity》 89 (2): 113–20. doi:10.1093/jhered/89.2.113. PMID9542158.