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- Smith, S.Y., Stockey, R.A., Nishida, H. & Rothwell, G.W. 2006. Trawetsia princetonensis gen. et sp. nov. (Blechnaceae): A Permineralized Fern from the Middle Eocene Princeton Chert. (Special Section: Evolution of Modern Ferns). International Journal of Plant Sciences 167(3): 711–719. DOI: 10.1086/501034 JSTOR