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Richelle-Maurer, E.; Degoudenne, Y.; Van de Vyver, G.; Dejonghe, L. (1994). Some aspects of the ecology of belgian freshwater sponges. In: Van Soest RWM, van Kempen TMG, Braekman JC (eds) Sponges in Time and Space. Biology, Chemistry, Paleontology. Balkema, Rotterdam, pp 341-350.