Leroy J., Chapelin-Viscardi J.-D., Genson G., Haran J., Pierre E. & Streito J.-C. 2020. Distinct barcodes for the Cereal leaf beetles Oulema melanopus and Oulema duftschmidi (Coleoptera: Chrysomelidae), two syntopical sibling species. European Journal of Entomology 117 : 490-503. (https://dx.doi.org/10.14411/eje.2020.052)