Russell, P., & Bartolozzi, L. (2019).

A revisit to the Melitaea taxon nigrogygia Verity, 1939 (Lepidoptera: Nymphalidae) and designation of a Lectotype

. Zootaxa, 4603(3), 592–596. https://doi.org/10.11646/zootaxa.4603.3.13