At: Historical biology, 15, 3 By: Poinar G. O.
journalAt: Bulletin of the Torrey Botanical Club, 96, 3 By: Eyde R. H., Bartlett H. H., Barghoorn E. S.
journalAt: Svensk Botanisk Tidskrift, 39, 3 By: Selling O. H.
journalAt: Publication of the Centre of Advanced Study in Geology, Panjab University, 3 By: Lakhanpal R. N.
journalAt: Bulletin of the Torrey Botanical Club, 21, 6 By: Hollick A.
journalAt: Canadian Journal of Botany, 68, 7 By: McIver E. E., Basinger J. F.
journalAt: Palaeontographica, Abtheilung, B, Paläophytologie, 291, 1-6 By: Kvaček Z., Teodoridis V., Mazouch P., Roiron P.
journalAt: Science bulletin, 60, 20 By: Huang Y.-J., Ji X.-P., Su T., Wang L., Deng C.-L., Li W.-Q., Luo H.-F., Zhou Z.-K.
journalAt: International Journal of Plant Sciences, 168, 3 By: Takahashi M., Friis E. M., Crane P. R.
bookAt: Transf. Paleobot., London, Academic Press By: Friis E. M., Crane P. R., Pedersen K. R.