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Annelid phylogeny and the status of Sipuncula and Echiura . BMC Evolutionary Biology. 7:57,(2007).
Molecular systematics of polychaetes (Annelida) . Hydrobiologia . 535/536, 309-318.(2005).
Molecular Evidence that Echiurans and Pogonophorans are Derived Annelids. Proceedings of the National Academy of Sciences (U.S.A.). 94, 8006-8009.(1997).
Molecular evidence that echiurans and pogonophorans are derived annelids. Proceedings of the National Academy of the Sciences of the United States of America . 94, 8006-8009.(1997).