Couri, M. S., and A. C. Pont. “The Male Terminalia of Some African Species of Helina Robineau-Desvoidy, 1830 (Diptera, Muscidae)”. Zootaxa, vol. 4399, no. 2, Mar. 2018, pp. 233–247, doi:10.11646/zootaxa.4399.2.7.