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.
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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
Publication
There is a 1961 supplement, and a 1963 2nd supplement, with the same basic title