Bergue, C., and J. Coimbra. “The Faunal and Geochemical Approaches in the Calcareous Microfossils and Their Applications to the Palaeoceanography and Palaeoclimatology”. Boletim Do Museu Paraense Emílio Goeldi - Ciências Naturais, Vol. 3, no. 2, Aug. 2008, pp. 115-26, doi:10.46357/bcnaturais.v3i2.680.