Bibliografía (4 obras)
Papers from the 6th International Conference on Trilobites and Their Relatives
2019
A revised correlation of Ordovician rocks in the British Isles
2000
Palaeontological Association Field Guide to Fossils, Fossils of the Upper Ordovician No. 7
1996
The Ordovician successions of the Oslo Region, Norway. by Alan W. Owen [and others]
1990
