1. E. Boltenhagen, “Révision du genre Classopollis Pflug,” Rev. Micropaléontol. 11, 29–44 (1968).
2. E. Boltenhagen, “Hexaporotricolpites potoniei, espèce nouvelle d’un pollen hexaporotricolpe du Crétacé supérieur du Gabon,” Grana Palynol. 9(1–3), 169–173 (1969).
3. A. F. Chlonova, Palynological Characterization of the Cretaceous Beds on the Kiya River (Western Siberia): Proceedings of the Institute of Geology and Geophysics, Vol. 312 (Nauka, Moscow, 1976) [in Russian].
4. S. Ferry, Y. Merran, D. Grosheny, and M. Mroueh, “The Cretaceous of Lebanon in the Middle East (Levant) Context,” Notebooks on Geology, Brest, Memoir 2(8), 38–42 (2007).
5. R. W. Hedlund and G. Norris, “Spores and Pollen Grains from Fredericksburgian (Albian) Strata, Marshall County, Oklahoma,” Pollen et Spores 10, 129–159 (1968).