HE, L., and H.-Z. ZHOU. “Taxonomy of the Genus <em>Protocypus</Em> J. Müller, 1923 (Coleoptera: Staphylinidae: Staphylinini) and Two New Species from China”. Zootaxa, vol. 4291, no. 3, July 2017, pp. 458–480, doi:10.11646/zootaxa.4291.3.2.