Amaya Aguirre, , Fernando Pardos, Carmen Roldan, Jesus Benito, Further Ultrastructural Observations on the Epidermis of Phoronids: Phoronis australis and Phoronis hippocrepia, Transactions of the American Microscopical Society, Vol. 112, No. 4 (Oct., 1993), pp. 280-291
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Aguirre et al. (1993) studied this question.
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