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Rigby, S and Dilly, P.N (1993) 'Growth rates of pterobranchs and the lifespan of graptolites.' Paleobiology, 19 (4). pp. 459-475.
Rigby, S and Rickards, B (1989) 'New evidence for the life habit of graptoloids from physical modelling.' Paleobiology, 15 (4). pp. 402-413.