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2. Schwertmannite on Mars? Spectroscopic analyses of schwertmannite, its relationship to other ferric minerals, and its possible presence in the surface material of Mars;Bishop,1996
3. A poorly crystallized oxyhydroxysulfate of iron formed by bacterial oxidation of Fe(II) in acid mine waters;Bigham;Geochim. Cosmochim. Acta,1990
4. Livro-Guia das excursões geológicas na Faixa Piritosa Ibérica;Carvalho,1976
5. Geology of massive sulphide deposits in the Spanish–Portuguese Pyrite Belt;Strauss;Geol. Bunds.,1974