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Nielsen, C. O.; Christensen, B. (1959). The Enchytraeidae: critical revision and taxonomy of European species (Studies on Enchytraeidae VII). Natura Jutlandica. 8-9: 1-160.
Nielsen, C. O.; Christensen, B. (1959). The Enchytraeidae: critical revision and taxonomy of European species (Studies on Enchytraeidae VII). Natura Jutlandica. 8-9: 1-160.