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Berg-Madsen, V.; Peel, J. S. (1978). Middle Cambrian monoplacophorans from Bornholm and Australia, and the systematic position of the bellerophontiform molluscs. Lethaia. 11(2): 113-125.
Berg-Madsen, V.; Peel, J. S. (1978). Middle Cambrian monoplacophorans from Bornholm and Australia, and the systematic position of the bellerophontiform molluscs. Lethaia. 11(2): 113-125.