In other publications she proposes three successive "waves" of expansion: Wave 1, predating Kurgan I, expansion from the lower Volga to the Dnieper, leading to coexistence of Kurgan I and the Cucuteni–Trypillia culture.
Dertil foreslog hun tre ekspansionsbølger: Bølge 1, fandt sted forud for Kurgan I, ekspansion fra den nedre del af Volga to the Dnieper, medførte en sameksistens mellem Kurgan I og Cucuteni-kulturen.