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APA Citation
Decombeix, A., & Meyer‐Berthaud, B. (2013). a Callixylon (Archaeopteridales, Progymnospermopsida) trunk with preserved secondary phloem from the Late Devonian of Morocco1. American journal of botany, 100(11), 2219–2230. http://access.bl.uk/ark:/81055/vdc_100057095325.0x000048