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From the following article:

Hydatellaceae identified as a new branch near the base of the angiosperm phylogenetic tree

Jeffery M. Saarela, Hardeep S. Rai, James A. Doyle, Peter K. Endress, Sarah Mathews, Adam D. Marchant, Barbara G. Briggs & Sean W. Graham

Nature 446, 312-315(15 March 2007)

doi:10.1038/nature05612