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Fjellberg, A. and Bernard, E.C. 2009. Review of Agrenia Börner, 1906 with descriptions of four new species from North America (Collembola, Isotomidae). Zootaxa. 2306, 1 (Dec. 2009), 17–28. DOI:https://doi.org/10.11646/zootaxa.2306.1.2.