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Anderson, L. I.; Dunlop, J. A.; Horrocks, C. A.; Winkelmann, H. M.; Eagar, R. M. C. (1997). Exceptionally preserved fossils from Bickershaw, Lancashire UK (Upper Carboniferous, Westphalian A (Langsettian)). Geological Journal. 32(3): 197-210.
Anderson, L. I.; Dunlop, J. A.; Horrocks, C. A.; Winkelmann, H. M.; Eagar, R. M. C. (1997). Exceptionally preserved fossils from Bickershaw, Lancashire UK (Upper Carboniferous, Westphalian A (Langsettian)). Geological Journal. 32(3): 197-210.