Reference
Robert B. Angus, Stanislav V. Litovkin, Fenglong Jia (2019): Notes on Helophorus (s.str.) kozlovi ZAITZEV, 1908, with description of two new species, re-evaluation of Helophorus s.str. FABRICIUS, 1775 and Trichohelophorus KUWERT, 1886, and revised keys to the subgenera of Helophorus and to the species of Helophorus s.str. (Coleoptera: Helophoridae) – Koleopterologische Rundschau – 89_2019: 127 - 150.