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Witte U, Barthel D. (1994). Reproductive cycle and oogenesis of Halichondria panicea (Pallas) in Kiel Bight. In: Van Soest RWM, van Kempen TMG, Braekman JC (eds) Sponges in Time and Space. Biology, Chemistry, Paleontology. Balkema, Rotterdam, pp 297-305.