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nih.gov
pubmed.ncbi.nlm.nih.gov
Crane, P.R.; Herendeen, P. & Friis, E.M. (2004). "Fossils and plant phylogeny". American Journal of Botany. 91 (10): 1683–99. doi:10.3732/ajb.91.10.1683. PMID21652317.
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