At: Annals and Magazine of Natural History, Series 12, 8, 93 By: Schelpe E. A. C. L. E.
journalAt: Palaeobotanist, 1955, 4 By: Vishnu-Mittre
journalAt: Proceedings and transactions of the Royal Society of Canada, Series 2, 8, Section 4 By: Penhallow D. P.
journalAt: Berichte der Deutschen Botanischen Gesellschaft, 29, 7 By: Schuster J.
journalAt: Földtani Közlöny, 89, 3 By: Andreánszky G., Mészáros M [= N].
journalAt: Földtani Közlöny, 86, 1 By: Greguss P.
bookAt: Ösnövénytan, Budapest, Akadémiai Kiadó By: Andreánszky G.
journalAt: Botanicheskii Zhurnal, 51, 9 By: Takhtajan A. L.
journalAt: Geologicheskij Zhurnal, 30, 3 By: Teteryuk V. K.
bookAt: Osnovy Paleobot., Moscow, Nedra By: Meyen S. V.