S.  Surveswaran, Wang, R. Jiang, Su, Y. C. F., and Saunders, R. M. K., ?Generic delimitation and historical biogeography in the early-divergent 'ambavioid' lineage of Annonaceae: Cananga, Cyathocalyx and Drepananthus?, TaxonTaxon, vol. 59, pp. 1721-1734, 2010.