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Fell, P.E. (1974). Porifera, in: Giese, A.C. et al. (Ed.) Reproduction of marine invertebrates: 1. Acoelomate and Pseudocoelomate Metazoans. pp. 51-132
In: Giese, A.C.; Pearse, J.S. (Ed.) (1974). Reproduction of marine invertebrates: I. Acoelomate and Pseudocoelomate Metazoans. Academic Press: New York. ISBN 978-0-12-282501-9. XI, 546 pp. https://dx.doi.org/10.1016/C2013-0-10718-0, more