J.  Minet, Basquin, P., Haxaire, J., Lees, D. C., and Rougerie, R., ?A new taxonomic status for Darwin's "predicted" pollinator: Xanthopan praedicta stat. nov. (Lepidoptera Sphingidae Sphinginae)?, Antenor, vol. 8, no. 1, pp. 69-86, 2021.

S. D.  Johnson, Balducci, M. G., Bijl, A., Castañeda-Zárate, M., Cozien, R. J., Ortmann, C. R., and van der Niet, T., ?From dusk till dawn: camera traps reveal the diel patterns of flower feeding by hawkmoths?, Ecological Entomology, vol. XX, no. X, pp. [1-5], 2019.

C.  Netz and Renner, S. S., ?Long-spurred Angraecum orchids and long-tongued sphingid moths on Madagascar: a time frame for Darwin?s predicted Xanthopan/Angraecum coevolution?, Biological Journal of the Linnean Society, vol. 122, no. 2, pp. 469-478, 2017.

L. T.  Wasserthal, ?Angraecum-Orchideen und langrüsslige Schwärmer, Bestäubung und Evolution?, Die Orchideen, vol. 66, no. 3, pp. 175-181, 2015.

E.  Staller, ?Long-spurred orchids and their pollinators - an investigation into multiple hypotheses to explain some of Darwin's contrivances?, The Open University, 2013.

M.  Moré, Amorim, F. W., Benitez-Vieyra, S., Medina, A. M., Sazima, M., and Cocucci, A. A., ?Armament imbalances: match and mismatch in plant-pollinator traits of highly specialized long-spurred orchids?, PLoS ONE, vol. 7, p. e41878, 2012.