I'm not surprised by Celtic, Celts penetrated relatively deep in the Balkans before they were driven out by Romans. Modern day Belgrade was actually founded by the Celts and named Sindidun and renamed Singidunum by the Romans later...
Phoenicians, I don't know, I guess as a seafaring nation they got to spread their genes around. Just a note, research for Serbia includes Montenegro, since samples were taken when Serbia and Montenegro were still one country.
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