1. Cambrian stratigraphy of the När 1 deep well, Gotland;Ahlberg;GFF,1989
2. Shell structure, ontogeny and affinities of the Lower Cambrian bivalved problematic fossil Mickwitzia muralensis Walcott, 1913;Balthasar;Lethaia,2004
3. Early Cambrian fossils from South Australia;Bengtson;Memoir of the Association of Australasian Palaeontologists,1990
4. Classification of olenellid trilobites and some Balto-Scandian species;Bergström;Norsk Geologisk Tidsskrift,1973
5. Uppermost Lower Cambrian biostratigraphy in Scania, Sweden;Bergström;GFF,1981