1. Belkin, H. E., Tewalt, S. J., Hower, J. C., Stucker, J. D., O’Keefe, J. M. K., Tatu, C. A., et al. (2010). Petrography and geochemistry of Oligocene bituminous coal from Jiu Valley, Petroşani basin (southern Carpathian Mountains), Romania. International Journal of Coal Geology,
82, 68–80.
2. Benda, L., Meulenkamp, J. E. (1979). Biostratigraphic correlations in the Eastern Mediterranean Neogene. 5. Calibration of sporomorph associations, marine microfossil and mammal zones, marine and continental stages and the radiometric scale. Annales Géologiques des Pays Helleniques h. S. 1, 61–70.
3. Boisserie, J.-R., Lihoreau, F., & Brunet, M. (2005). Origins of Hippopotamidae (Mammalia, Cetartiodactyla) towards resolution. Zoologica Scripta,
34, 119–143.
4. Christanis, K. (2004). Coal facies studies in Greece. In: M. Hámor-Vidó (Ed.), Reconstruction of Peat-Forming Environments: A Global Historical Review. International Journal of Coal Geology,
58, 99–106.
5. Coombs, W. P., & Coombs, M. C. (1977). The origin of anthracotheres. Neues Jahrbuch für Geologie und Paläontologie Mh,
10, 584–599.