G. E.  Schatz, Maas, P. J. M., H. van de Kamer, M. -, Westra, L. Y. T., and Wieringa, J. J., ?Revision of the Neotropical genus Sapranthus (Annonaceae)?, Blumea - Biodiversity, Evolution and Biogeography of Plants, vol. 63, 2018.

G. E.  Schatz, Maas, P. J. M., H. van de Kamer, M. -, Westra, L. Y. T., and Wieringa, J. J., ?Revision of the Neotropical genus Desmopsis (Annonaceae)?, Blumea, vol. 63, 2018.

P. J. M.  Maas and Westra, L. Y. Th., ?New species of Annonaceae from the Neotropics and miscellaneous notes?, BlumeaBlumea, vol. 55, pp. 259-275, 2010.

P. J. M.  Maas and Westra, L. Y. T.  h, ?A taxonomic survey of Guatteria section Mecocarpus including the genera Guatteriopsis and Guatteriella p.p. (Annonaceae)?, BlumeaBlumea, vol. 56, pp. 113-145, 2011.

P. J. M.  Maas, Westra, L. Y. Th., Chatrou, L. W., and , ?Duguetia (Annonaceae)?, Flora Neotropica, MonographFlora Neotropica, Monograph, vol. 88, pp. 1-274, 2003.

P. J. M.  Maas, Westra, L. Y. Th., and Vermeer, M., ?Revision of the Neotropical genera Bocageopsis, Onychopetalum, and Unonopsis (Annonaceae)?, BlumeaBlumea, vol. 52, pp. 413-554, 2007.

P. J. M.  Maas, Maas, H., Miralha, J. M. S., and Junikka, L., ?Flora da Reserva Ducke, Amazonas, Brasil: Annonaceae?, RodriguésiaRodriguésia, vol. 58, pp. 617-662, 2007.

P. J. M.  Maas and H. van de Kamer, M. -, ?Annonaceae. In: Mori, S.A., G. Cremers, C.A. Gracie, J.-J. de Granville, S.V. Heald, M. Hoff & J.D. Mitchell (eds.) - Guide to the vascular plants of Central French Guiana 2: Dicotyledons?, Memoirs of the New York Botanical GardenMemoirs of the New York Botanical Garden, vol. 76, pp. 53-67, pl. 11-13, 2002.

P. J. M.  Maas and Rainer, H., ?Annonaceae?, in Checklist of the plants of the Guianas (Guyana, Surinam, French Guiana), ed. 2, J.  Boggan, Funk, V., Kelloff, C., Hoff, M., Cremers, G., and Feuillet, C., Eds. Washington (D.C.): Biological Diversity of the Guianas Program, Smithsonian Institution, 1997, pp. 45-47.

P. J. M.  Maas, Westra, L. Y. T., and Vermeer, M., ?Revision of the Neotropical genera Bocageopsis, Onychopetalum, and Unonopsis (Annonaceae)?, BlumeaBlumea, vol. 52, pp. 413-554, 2007.

P. J. M.  Maas and Westra, L. Y. Th., ?Studies in Annonaceae II. A monograph of the genus Anaxagorea A. St. Hil., Part 1?, Botanische Jahrbücher für Systematik, Pflanzengeschichte und PflanzengeographieBotanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie, vol. 105, pp. 73-134, 1984.

P. J. M.  Maas and Westra, L. Y. Th., ?Studies in Annonaceae II. A monograph of the genus Anaxagorea A. St. Hil., Part 2?, Botanische Jahrbücher für Systematik, Pflanzengeschichte und PflanzengeographieBotanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie, vol. 105, pp. 145-204, 1985.

P. J. M.  Maas and Westra, L. Y. Th., ?Rollinia (Annonaceae)?, Flora Neotropica, MonographFlora Neotropica, Monograph, vol. 57, pp. 1-188, 1992.

P. J. M.  Maas and Westra, L. Y. Th., ?Revision of the neotropical genus Pseudoxandra (Annonaceae)?, BlumeaBlumea, vol. 48, pp. 201-259, 2003.

P. J. M.  Maas and Westra, L. Y. Th., ?A new species of Pseudoxandra (Annonaceae)?, BlumeaBlumea, vol. 50, pp. 61-64, 2005.

P. J. M.  Maas, Koek-Noorman, J., and Westra, L. Y. T.  h, ?Studies in Annonaceae XVIII. New species from the Neotropics and miscellaneous notes?, Botanische Jahrbücher für Systematik, Pflanzengeschichte und PflanzengeographieBotanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie, vol. 115, pp. 77-95, 1993.

R. H. J.  Erkens, Chatrou, L. W., Koek-Noorrnan, J., Maas, J. W., and Maas, P. J. M., ?Classification of a large and widespread genus of Neotropical trees, Guatteria (Annonaceae) and its three satellite genera Guatteriella, Guatteriopsis and Heteropetalum?, TaxonTaxon, vol. 56, pp. 757-774, 2007.

R. H. J.  Erkens and Maas, P. J. M., ?The Guatteria group disentangled: sinking Guatteriopsis, Guatteriella, and Heteropetalum into Guatteria.?, RodriguésiaRodriguésia, vol. 59, pp. 401-406, 2008.

R. H. J.  Erkens, Maas, P. J. M., Chatrou, L. W., Schatz, G. E., and Zamora, N., ?Seven taxonomic discoveries in Annonaceae from southeastern Central America?, BlumeaBlumea, vol. 51, pp. 199-220, 2006.

R. H. J.  Erkens, Maas, P. J. M., and Schatz, G. E., ?Preliminary Flora Mesoamericana treatment of Guatteria?, in From morphological nightmare to molecular conundrum. Phylogenetic, evolutionary and taxonomic studies on Guatteria (Annonceae), R. H. J.  Erkens, Ed. Utrecht: PhD-thesis, Utrecht University, 2007, pp. 179-217.

L. W.  Chatrou, Maas, P. J. M., Repetur, C. P., and Rainer, H., ?Preliminary list of Ecuadorean Annonaceae?, in Estudios sobre diversidad y ecología de plantas  (Memorias del II Congreso Ecuatoriano de Botánica .. 1995), R.  Valencia and Balslev, H., Eds. Quito/Aarhus: Pontificia Universidad Catolica del Ecuado/Universidad de Aarhus, 1997, pp. 97-122.