Martinsson, S., M. Klinth, and C. Erséus. “Distribution and Genetic Diversity of Two Earthworms, Helodrilus Oculatus and Satchellius Mammalis (Clitellata: Lumbricidae) in Scandinavia”. Fauna Norvegica, vol. 41, May 2021, pp. 1-14, doi:10.5324/fn.v41i0.3874.