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Ruhfel, Bradley; Lindsay, Stuart; Davis, Charles C. (2008). "Phylogenetic Placement of Rheopteris and the Polyphyly of Monogramma (Pteridaceae s.l.): Evidence from rbcL Sequence Data". Systematic Botany. 33 (1): 37–43. doi:10.1600/036364408783887410. S2CID84001172.