"Although there is a consensus among archaeologists working on the steppes that the Andronovo culture is in the right place at the right time, and thus is to be considered Indo-Iranian, there is neither textual, ethnohistoric, nor archaeological evidence, individually or in combination, that offers a clinching argument for this consensus. Kuzmina’s carefully constructed methodology simply cannot be applied to the Andronovo culture. The Andronovo culture is well over a thousand years distant from any textual tradition, making any linguistic and/or ethnohistoric attribution extremely tenuous."
January 1, 1970
https://en.wikiquote.org/wiki/Andronovo_culture