McHugh, D. (1997). Molecular evidence that echiurans and pogonophorans are derived annelids. Proceedings of the National Academy of Sciences of the United States of America. 94: 8006-8009.
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McHugh, D.
1997
Molecular evidence that echiurans and pogonophorans are derived annelids
Proceedings of the National Academy of Sciences of the United States of America