Peel, J. S. (1974). Systematics, ontogeny and functional morphology of Silurian trilobed bellerophontacean gastropods. Bulletin of the Geological Society of Denmark. 23: 231-264.
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Peel, J. S.
1974
Systematics, ontogeny and functional morphology of Silurian trilobed bellerophontacean gastropods