Otar Lordkipanidze (2000), Phasis: The River and City in Colchis. Franz Steiner Verlag, ISBN 3-515-07070-2.
Etymology
The name is apparently linked to ფაზისი(pazisi), but the etymology is a matter of a scholarly dispute. "Phasis" (Φᾶσις(Fᾶsis)) is first recorded in Hesiod's Theogony (c. 700 BC) as a name of the river, not a town. Since Erich Diehl, 1938, first suggested a non-Hellenic origin of the name and asserted that Phasis might have been a derivative of a local hydronym, several explanations have been proposed, linking the name to the Proto-Georgian-Zan*poti, Svan*pasid, and even to a Semitic word, meaning "a gold river".