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J.  Koek-Noorman, Westra, L. Y. Th., and Maas, P. J. M., ?Studies in Annonaceae. XIII. The role of morphological characters in subsequent classifications of Annonaceae. A comparative survey?, TaxonTaxon, vol. 39, pp. 16-32, 1990.

A. K.  van Setten and Maas, P. J. M., ?Studies in Annonaceae. XIV. Index to generic names of Annonaceae.?, Taxon, vol. 39, pp. 675-690, 1990.