References

Segerstrale SG. 1954. The Freshwater Amphipoda, Gammarus pulex (L.) and Gammarus lacustris G.O. Sars, in Denmark and Fennoscandia – a Contribution to the Late- and Post-Glacial Immigration History of the Aquatic Fauna of Northern Europe. Comment. biol., Soc. Sci. Fenn. 15: 1-91.