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Journal Article
Stewart, Sarah Elizabeth, Clarkson, Euan Neilson Kerr, Ahlgren, John, Ahlberg, Per and Schoenemann, Brigitte (2015). Sphenothallus from the Furongian (Cambrian) of Scandinavia. GFF, 137 (1). S. 20 - 25. ABINGDON: TAYLOR & FRANCIS LTD. ISSN 2000-0863
Zhang, Xingliang 
ORCID: 0000-0003-1103-2799, Ahlberg, Per, Babcock, Loren E., Choi, Duck K., Geyer, Gerd, Gozalo, Rodolfo ORCID: 0000-0001-7985-9843, Hollingsworth, J. Stewart, Li, Guoxiang, Naimark, Elena B., Pegel, Tatyana, Steiner, Michael, Wotte, Thomas and Zhang, Zhifei
(2017).
Challenges in defining the base of Cambrian Series 2 and Stage 3.
Earth-Sci. Rev., 172.
S. 124 - 140.
AMSTERDAM:
ELSEVIER SCIENCE BV.
ISSN 1872-6828