At: Mémoires de la Société Belge de Géologie, de Paléontologie et d’Hydrologie, Series, Nouvelle Série in 4°, 5 By: Delcourt A. F. L. G., Sprumont G.
journalAt: Palaeontographica, Abtheilung, B, Paläophytologie, 177, 5-6 By: Vozenin-Serra C.
journalAt: Review of Palaeobotany and Palynology, 67, 1-2 By: Vozenin-Serra C., Privé-Gill C.
journalAt: Review of Palaeobotany and Palynology, 68, 1-2 By: Vozenin-Serra C., Privé-Gill C.
journalAt: La Nature, 10, Sem. 2, 479 By: de Saporta G.
journalAt: La Nature, 10, Sem. 2, 482 By: de Saporta G.
journalAt: Boletim da Sociedade Geológica de Portugal, 20, 1-2 By: Teixeira С.
journalAt: Mémoires du Musée Royal d’Histoire Naturelle de Belgique, 5 By: Marty P.
journalAt: Feddes Repertorium, 121, 1-2 By: Süss H., Velitzelos E.
journalAt: Argumenta Palaeobotanica, 4 By: Remy W., Remy R.