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APA Citation
Melchin, M. J., Lenz, A. C., & Kozłowska, A. (2017). retiolitine graptolites from the Aeronian and lower Telychian (Llandovery, Silurian) of Arctic Canada. Journal of paleontology, 91, 116–145. http://access.bl.uk/ark:/81055/vdc_100039631995.0x000054