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J. B.  Mols, Keßler, P. J. A., Rogstad, S. H., and Saunders, R. M. K., ?Reassignment of six Polyalthia species to the new genus Maasia (Annonaceae): molecular and morphological congruence?, Systematic BotanySystematic Botany, vol. 33, pp. 490-494, 2008.

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P. J. A.  Keßler, ?Subdivision and relationships of the Asiatic - Australian genera of Annonaceae?, RheedeaRheedea, vol. 5, pp. 97-102, 1995.

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P. J. A.  Keßler and Sidiyasa, K., Trees of the Balikpapan-Samarinda Area, East Kalimantan, Indonesia. A manual to 280 selected species. Kalimantan. [Indonesian]: MOFEC-Tropenbos - Kalimantan Project, 1999.

P. J. A.  Keßler and van Heusden, E. C. H., ?The Annonaceae of the Balikpapan-Samarinda area, East Kalimantan, Indonesia?, RheedeaRheedea, vol. 3, pp. 50-89, 1993.

P. J. A.  Keßler, ?Revision der Gattung Orophea Blume (Annonaceae)?, BlumeaBlumea, vol. 33, pp. 1-80; pl. 1-12, 1988.

P. J. A.  Keßler, ?Studies on the tribe Saccopetaleae (Annonaceae) - I. Revision of the genus Platymitra Boerlage?, BlumeaBlumea, vol. 33, pp. 471-476, 1988.

T.  Chaowasku, Keßler, P. J. A., and van der Ham, R. W. J. M., ?A taxonomic revision and pollen morphology of the genus Dendrokingstonia (Annonaceae)?, Botanical Journal of the Linnean SocietyBotanical Journal of the Linnean Society, vol. 168, pp. 76-90, 2012.

T.  Chaowasku, Keßler, P. J. A., Punnadee, S., and van der Ham, R. W. J. M., ?Taxonomic novelties and pollen morphological study in the genus Neo-uvaria (Annonaceae)?, PhytotaxaPhytotaxa, vol. 32, pp. 27-42, 2011.