title: The origin of the concept of 'doubles'.
mesh_terms: D002194:Capgras Syndrome / Q000266:history / Q000523:psychology; D003702:Delusions / Q000266:history* / Q000523:psychology; D005495:Folklore; D000076145:Greece, Ancient; D049690:History, Ancient; D006801:Humans; D008091:Literature; D009229:Mythology; D013577:Syndrome