Bulletin of the Geological Society of Denmark, Vol. 36/3-4 pp. 259-261
PDF) A review of the Andrarum Limestone and the upper alum shale (Middle Cambrian) of Bornholm, Denmark | Vivianne Berg-madsen - Academia.edu
Agraulos ceticephalus and other Cambrian trilobites in the subfamily Agraulinae from Bohemia, Newfoundland and Wales - Fletcher - 2017 - Papers in Palaeontology - Wiley Online Library