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Briggs, D.E.G, Kear, A.J, Baas, M, Leeuw, J.W and Rigby, S (1995) 'Decay and composition of the hemichordate Rhabdopleura: implications for the taphonomy of graptolites.' Lethaia, 28 (1). pp. 15-23.
Rigby, S (1992) 'Graptoloid feeding efficiency, rotation and astogeny.' Lethaia, 25 (1). pp. 51-68.
Rigby, S (1994) 'Hemichordate skeletal growth: shared patterns in Rhabdopleura and graptoloids.' Lethaia, 27 (4). pp. 317-324.
Rigby, S (1997) 'A comparison of the colonization of the planktic realm and the land.' Lethaia, 30 (1). pp. 11-17.