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2. ^Cristina Fărcas: Study of the Upper Eocene-Lower Oligocene continental formations from northwestern side of Transylvanian Depression - Biostratigraphy, and palaeoenvironmental reconstructions based on land vertebrates. Babeș-Bolyai-Universität, Cluj-Napoca, 2011
3. ^Matthew C. Mihlbachler: Species taxonomy, phylogeny, and biogeography of the Brontotheriidae (Mammalia: Perissodactyla). Bulletin of the American Museum of Natural History 311, 2008, ISSN 0003-0090, S. 1–475.