https://uralic.eu/2019/08/don-volga-r1b-m269-rich-proto-indo-europeans-of-pre-yamnaya-ancestry/
Volga Basin R1b-rich Proto-Indo-Europeans of (Pre-)Yamnaya ancestry | Uralic.eu
Apr 14, 2020 - David W. Anthony's latest opinion on the Proto-Indo-European homeland of the Don-Volga basin with Khvalynsk and Repin - Yamnaya.
proto indo europeansvolga basinrichpreyamnaya