BIOTIC References
4475Wapstra, M. & van Soest, R.W.M., 1987. Sexual reproduction, larval morphology and behaviour in demosponges from the southwest of the Netherlands. Taxonomy of Porifera from the North East Atlantic and Mediterranean Sea (ed. J. Vacelet and N. Boury-Esnault), pp. 281-307. (NATO Advanced Studies Institute Vol. G13) Berlin: Springer-Verlag
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