Downie, Douglas A, Gullan, P J. Phylogenetic congruence of mealybugs and their primary endosymbionts. 2005.

Tourle, Robyn, Downie, Douglas A, Villet, Martin H. Flies in the ointment a morphological and molecular comparison of Lucilia cuprina and Lucilia sericata (Diptera: Calliphoridae) in South Africa. 2009.

Paterson, Iain D, Mangan, Rose, Downie, Douglas A, Coetzee, Julie A, Hill, Martin P, Burke, Ashley M, Downey, Paul O, Henry, Thomas J, Compton, Stephen G. Wiley; 2016. Two in one: cryptic species discovered in biological control agent populations using molecular data and crossbreeding experiments.