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In page Pelasgians:

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Vladimir I. Georgiev, a Bulgarian linguist, asserted that the Pelasgians spoke an Indo-European language and were, more specifically, related to the Thracians.[1][2] Georgiev also proposed, relying on a sound-shift model, that pelasgoi was a cognate of a Proto-Indo-European root and Greek Πέλαγος pelagos "sea".[citation needed]