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Cutler, Edward B.; Gibbs, Peter E. (1985). A phylogenetic analysis of higher taxa In the phylum Sipuncula. Systematic Zoology. 34(2): 162-173.
Cutler, Edward B.; Gibbs, Peter E. (1985). A phylogenetic analysis of higher taxa In the phylum Sipuncula. Systematic Zoology. 34(2): 162-173.