The claim that Adolf Hitler escaped his Berlin bunker to live incognito in Argentina first gained currency in 1945, when Joseph Stalin spoke of it.
Since then the idea has resurfaced occasionally, with alleged photographic and documentary evidence.
Now the theory that the German dictator followed his fellow Nazis Adolf Eichmann and Josef Mengele to South America is at the centre of a fresh row.
The authors of the 2011 book Grey Wolf: The Escape of Adolf Hitler, which was made into a documentary film this year, have been accused of plagiarism by an Argentine journalist, Abel Basti.
Grey Wolf, published by Sterling Publishing, challenged the accepted view that Hitler shot himself in his Berlin bunker on April 30, 1945 and that Eva Braun also committed suicide by taking cyanide. Arguing that American intelligence turned a blind eye to Hitler's escape in return for access to Nazi war technology, Gerrard Williams and Simon Dunstan set out the case that the Fuhrer and Braun made a home in the Andes foothills and had two daughters. Hitler, they claim, escaped punishment and lived in Patagonia until his death in 1962, aged 73.