1. Acid-resistant microfossils used in the determination of Palaeozoic palaeoenvironments in Libya;Al-Ameri;Palaeogeography, Palaeoclimatology, Palaeoecology,1983
2. The graptolite correlation of the North American Upper Ordovician standard;Bergström;Lethaia,1986
3. Contribuição ao conhecimento dos microfósseis Silurianos e Devonianos da Bacia do Maranhão;Brito,1965
4. Stratigraphic lexicon for Michigan;Catacosinos;Bulletin Michigan Geological Survey Division,2001
5. Les cellules nageuses des algues dans l’embranchement des Chromophycées;Chadefaud;Comptes Rendus Hebdomadaire des Séances de l’Académie des Sciences de Paris,1950