Spikkeland, I., B. Kinsten, G. Kjellberg, J. P. Nilssen, and R. Väinölä. “The Aquatic Glacial Relict Fauna of Norway – an Update of Distribution and Conservation Status”. Fauna Norvegica, vol. 36, Dec. 2016, pp. 51-65, doi:10.5324/fn.v36i0.1994.