L. M.  Primo, Domingos-Melo, A., Galetto, L., and Machado, I. C., ?Nectar secretion patterns are associated to nectar accessibility in  aguild of crepuscular-nocturnal flowering plants?, Plant Ecology, pp. 1-14, 2022.

M.  Pedron, Buzatto, C. R., Singer, R. B., Batista, J. A. N., and Moser, A., ?Pollination biology of four sympatric species of Habenaria (Orchidaceae: Orchidinae) from southern Brazil?, Botanical Journal of the Linnean Society, vol. 170, no. 2, pp. 141-156, 2012.

B.  Gehlen, ?Neue Sphingiden-Arten, -Unterarten und -Formen?, Internationale Entomologische Zeitschrift, vol. 21, pp. 391-401, 1928.