Palmer was one of the linguists who were investigating the theories that some unknown language or languages were spoken in prehistoric Greece before the settlement of Proto-Greek speakers in the area. So this is the question of an ancient linguistic Pre-Greek substrate in Greece. According to Palmer, this may have been one of the ancient Anatolian languages, perhaps a Luwian language. He suggested that the language of Linear A might be Luwian on the basis of -ss- and -nd- (corresponding to -ss- and -nth- in mainland Greece) placenames being widespread in Western Anatolia.
^Finkelberg, Margalit (2005). Greeks and Pre-Greeks: Aegean Prehistory and Greek Heroic Tradition. Cambridge. ISBN978-0521107990, esp. 42–64. Reveiewed in Beckman, Gary (Dec–Jan 2008/2009). "Greeks and Pre-Greeks: Aegean Prehistory and Greek Heroic Tradition by Margalit Finkelberg". The Classical Journal (The Classical Association of the Middle West and South) 104 (2): 175–177. doi:10.2307/27750230. JSTOR27750230.Check date values in: |date= (help)