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APA Citation
Tortello, M. F., & Esteban, S. B. (2016). early Ordovician trilobites from the Iruya area (Cordillera Oriental, northwestern Argentina) and their stratigraphic significance. Journal of paleontology, 90, 923–958. http://access.bl.uk/ark:/81055/vdc_100036192539.0x00002f