R. H. J.  Erkens, Chatrou, L. W., Maas, J. W., van der Niet, T., and Savolainen, V., ?A rapid diversification of rainforest trees (Guatteria; Annonaceae) following dispersal from Central into South America?, Molecular Phylogenetics and EvolutionMolecular Phylogenetics and Evolution, vol. 44, pp. 399-411, 2007.

R. H. J.  Erkens, Chatrou, L. W., Maas, J. W., van der Niet, T., and Savolainen, V., ?A rapid diversification of rainforest trees (Guatteria; Annonaceae) following dispersal from Central into South America?, Molecular Phylogenetics and Evolution, vol. 44, pp. 399-411, 2007.