Two brazilians doctors published a book about it in 2004: http://www.amazon.com/Secreta-Michelangelo-Barreto-Marcelo-Oliveira/dp/8575811142 Abusive comment hidden. (Show it anyway.)
There's more about Goialth (or Hercules). Check it out:http://www.oregonlive.com/news/oregonian/index.ssf?/base/news/11685759354450.xml&coll=7 Abusive comment hidden. (Show it anyway.)
http://www.oregonlive.com/news/oregonian/index.ssf?/base/news/11685759354450.xml&coll=7