P. J. M.  Maas, Westra, L. Y. T., S. Guerrero, A., Lobão, A. Q., Scharf, U., Zamora, N. A., and Erkens, R. H. J., ?Confronting a morphological nightmare: revision of the Neotropical genus Guatteria (Annonaceae)?, Blumea - Biodiversity, Evolution and Biogeography of Plants, vol. 60, no. 1, pp. 1 - 219, 2015.

U.  Scharf, Maas, P. J. M., and Morawetz, W., ?Five new species of Guatteria (Annonaceae) from the Pakaraima Mountains, Guyana?, BlumeaBlumea, vol. 50, pp. 563-573, 2005.

U.  Scharf, Maas, P. J. M., and Morawetz, W., ?Five new species of Guatteria (Annonaceae) from French Guiana, Guyana and Suriname?, BlumeaBlumea, vol. 51, pp. 117-130, 2006.

U.  Scharf, Maas, P. J. M., and Morawetz, W., ?Guatteria richardii (Annonaceae), rediscovered along with two new species from French Guiana?, BlumeaBlumea, vol. 51, pp. 541-552, 2006.

U.  Scharf, Maas, P. J. M., and Prévost, M. F., ?An unusual new species of Guatteria (Annonaceae) from French Guiana and adjacent Brazil (Amapá)?, BlumeaBlumea, vol. 53, pp. 515-523, 2008.