At: Journal of the Botanical Research Institute of Texas, 14, 1 By: Poinar G. O., Chambers K. L.
journalAt: Dări de seamă ale ședințelor / Institutul Geologic şi Geofizica, 1973-1974, 61, 3 By: Stancu I., Ţicleanu N.
journalAt: Věstník Ústředního Ústavu Geologického, 52, 3 By: Bůžek Č.
journalAt: Nature, 448, 7157 By: Ramírez S. R., Gravendeel B., Singer R. B., Marshall C. R., Pierce N. E.
bookAt: Iskop. Tsvetk. Rast. Ross., St.-Petersburg, 4 By: Arbuzova O. N., Balueva G. A.
journalAt: International Journal of Advanced Research in Science, Communication and Technology, 4, 3 By: Yadav A. M.
journalAt: Review of Palaeobotany and Palynology, 162, 1 By: Conran J. G., Kaulfuss U., Bannister J. M., Mildenhall D. C., Lee D. E.
journalAt: Novon, 24, 2 By: Srivastava G., Mehrotra R. C.
journalAt: Comptes rendus de l'Académie des sciences, Series, 2, Mécanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Terre, 315, 12 By: Gerrienne P.
journalAt: Glas Srpske Akademije Nauka i Umetnosti, 335, 49 By: Radoičić R.