Oliveira, Sonia Maria Barros de, e João Henrique Larizzatti. 2006. “ Some Observations on Gold in the Weathering Profile at Garimpo Porquinho, an Artisanal Mine in the Tapajós Region, Brazilian Amazon ”.
Geologia USP. Série Científica 5 (2): 1-11.
https://doi.org/10.5327/S1519-874X2006000100001.