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Edwards, Ceiridwen J.; Ginja, Catarina; Kantanen, Juha; Perez-Pardal, Lucía; Tresset, Anne; Stock, Frauke; Gama, Luis T.; Penedo, M. Cecilia T.; Bradley, Daniel G.; Lenstra, Johannes A.; Nijman, Isaäc J.; Dolf, Gaudenz (2011). Dual origins of dairy cattle farming - evidence from a comprehensive survey of European Y-chromosomal variation. PLoS ONE, 6(1), e15922. Lawrence, Kans.: Public Library of Science 10.1371/journal.pone.0015922
