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Rodrigo AG, Bergquist PR, Bergquist PL, Reeves RA. (1994). Are sponges animals? An investigation into the vagaries of phylogenetic inference. In: Van Soest RWM, van Kempen TMG, Braekman JC (eds) Sponges in Time and Space. Biology, Chemistry, Paleontology. Balkema, Rotterdam, pp 47-54.