Analysis of information sources in references of the Wikipedia article "Proto-Greek language" in English language version.
"the arrival of the Proto-Greek -speakers took place at various sites in central and southern Greece at the beginning and end of the Early Helladic III period.
Thus in the region defined just above, roughly northern and north-western Greece, one finds only archaic Greek place-names. Consequently, this is the proto-Hellenic area, the early homeland of the Greeks where they lived before they invaded central and southern Greece.
Supports an interpretation of Marija Gimbutas' Kurgan theory involving the migration of a proto-Greek population which arrived in Greece during the Early Helladic period.
"the arrival of the Proto-Greek -speakers took place at various sites in central and southern Greece at the beginning and end of the Early Helladic III period.
Thus in the region defined just above, roughly northern and north-western Greece, one finds only archaic Greek place-names. Consequently, this is the proto-Hellenic area, the early homeland of the Greeks where they lived before they invaded central and southern Greece.
Supports an interpretation of Marija Gimbutas' Kurgan theory involving the migration of a proto-Greek population which arrived in Greece during the Early Helladic period.