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Maisey, JG (1983), Cranial Anatomy of Hybodus basanus Egerton from the Lower Cretaceous of England. Am. Mus. Nov. No. 2758, 64pp. Cladoselachida.
Maisey, JG (1984), Higher elasmobranch phylogeny and biostratigraphy. Zool. J. Linn. Soc. 82: 33-54. Synechodontiformes, Synechodus.
Maisey, JG (1984a), Chondrichthyan phylogeny: a look at the evidence. J. Vert Paleontol. 4: 359-371. Cladoselachida, Synechodontiformes.
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Marss, T (2002), Silurian and Lower Devonian anaspids (Agnatha) from Severnaya Zemlya (Russia), Geodiversitas 24: 123-137. Cephalaspidida
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