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Wapstra, M.; van Soest, R.W.M. (1987). Sexual reproduction, larval morphology and behaviour in demosponges from the southwest of the Netherlands. In: Vacelet J., Boury-Esnault N. (eds) Taxonomy of Porifera from the N.E. Atlantic and the Mediterranean Sea. NATO Advanced Science Institutes Series G, Ecological Sciences, Springer, Heidelberg. 13: 281-307.