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de Weerdt, W.H.; van Soest, R.W.M. (1987). A review of north-eastern Atlantic Hemigellius (Niphatidae, Haplosclerida), In: Vacelet, J.; Boury-Esnault, N. (Ed.) (1987). Taxonomy of Porifera from the N.E. Atlantic and Mediterranean Sea. NATO ASI Series G: Ecological sciences. 13: pp. 309-321.