Gresens, S., E. Stur, and T. Ekrem. “Phenotypic and Genetic Variation Within the Cricotopus Sylvestris Species-Group (Diptera, Chironomidae), across a Nearctic - Palaearctic Gradient”. Fauna Norvegica, vol. 31, Oct. 2012, p. 137, doi:10.5324/fn.v31i0.1417.