At: Flora, 10, 1, 22 By: Sternberg K. M.
journalAt: Heidelberger Jahrbücher der Literatur, 22, Hälfte 1, 5 By: Bronn H. G.
journalAt: Bulletin of the Torrey Botanical Club, 26 By: Britton E. G.
journalAt: Journal of Systematic Palaeontology, 12, 7-8 By: Deng S.-H., Hilton J., Glasspool I., Dejax J.