Is it possible to deny that there were contacts between the Sumerians and Indo-Europeans in the 4th and 3rd millennium BC? - Quora
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Phylogenetic and areal models of Indo-European relatedness: The role of contact in reconstruction in: Journal of Language Contact Volume 6 Issue 2 (2013)
![PDF] Ancestry-constrained phylogenetic analysis supports the Indo-European steppe hypothesis: Supplementary materials | Semantic Scholar PDF] Ancestry-constrained phylogenetic analysis supports the Indo-European steppe hypothesis: Supplementary materials | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/9758f1cd6850c4131af304ec8ae57c8f148da8b3/34-Figure10-1.png)