At: Review of Palaeobotany and Palynology, 55, 4 By: Pocock S. A. J., Vasanthy G.
journalAt: Botanisches Centralblatt, 3, 11, 1=27 By: Steinmann G.
journalAt: Palaeontology, 10, 4 By: Mortimer M. G., Chaloner W. G.
journalAt: Botany, 100 By: Poinar G. O., Kevan P. G., Jackes B. R.
journalAt: Review of Palaeobotany and Palynology, 149, 3-4 By: Wang Q.
journalAt: Taxon, 50, 4 By: Doweld A. B.
bookAt: Iskop. Tsvetk. Rast. SSSR, Leningrad, Izdatel'stvo Nauka, Leningradskoe otdelenie, 1974, 1 By: Dorofeev P. I.
bookAt: Iskop. Tsvetk. Rast. SSSR, Leningrad, Izdatel'stvo Nauka, Leningradskoe otdelenie, 2 By: Budantsev L. Yu.
journalAt: International Journal of Plant Sciences, 164, 5 By: Pigg K. B., Manchester S. R., Wehr W. C.
journalAt: Bulletin / Grønlands Geologiske Undersøgelse, 99 By: Koch B. E.