Indo-European cereal terminology suggests a Northwest Pontic homeland for the core Indo-European languages. by Guus Kroonen, Anthony Jakob, Axel I Palmér, Paulus van Sluis, Andrew Wigman

“…Recent palaeogenomic studies support scenarios in which the core Indo-European languages spread with the expansion of Early Bronze Age Yamnaya herders that originally inhabited the East European steppes. …”
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Contact linguistique et glottogenèse by Cyril Aslanov, Sibylle Kriegel, Georges Daniel Véronique

“…This would explain the high proportion of words of non-Indo-European origin in most of the ancient Indo-European languages: Hittite; Sanskrit; Avestan; ancient Greek; Italic languages; Celtic languages; Germanic languages; Slavic languages; Baltic languages; Tocharian.This study carried out jointly by two Creolists and a specialist in historical and comparative grammar makes it possible to recall what is at stake in the notion of glottogenesis: not only an awareness of the fact that languages have a beginning, which may be more or less calculated, but also that these beginnings, far from being creations ex nihilo, result from new syntheses obtained from pre-existing languages. …”
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The Peoples of the Steppe Frontier in Early Chinese Sources by Edwin G. Pulleyblank

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