Albrecht, A. C. “Identification Guide to Nordic Aphids Associated With Mosses, Horsetails and Ferns (Bryophyta, Equisetophyta, Polypodiophyta) (Insecta, Hemiptera, Aphidoidea)”. European Journal of Taxonomy, no. 145, Oct. 2015, doi:10.5852/ejt.2015.145.