It is therefore historically irresponsible for the linguist to speak of 'Proto-Indo-European' in the 4th millen- nium, and linguistically meaningless for the archaeologist to argue about 'Proto-Indo-Europeans' living somewhere before ca 2500 B.C.
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Zimmer, Stefan. 1988. "On Dating Indo-European: A Call for Honesty." Journal of Indo-European Studies 16:371-375. 372-5 Zimmer (1988), quoted in Bryant, E. F. (2001). The Quest for the Origins of Vedic Culture : the Indo-Aryan migration debate. Oxford University Press. chapter 12