R. H. J.  Erkens, Chatrou, L. W., and Couvreur, T. L. P., ?Radiations and key innovations in an early branching angiosperm lineage (Annonaceae; Magnoliales)?, Botanical Journal of the Linnean SocietyBotanical Journal of the Linnean Society, vol. 169, pp. 117-134, 2012.