1. Abushik, A.F. et al. (1990): Palaeozoic ostracodes. — In:Sokolov, B.S. (Ed.): Prakticheskoe rukovodstvo po mikrofaune SSSR [Practical Manual on Microfauna of USSR],4: 1–355. [In Russian]
2. Astini, R.A. (2002): La “raegacapa” Parcha (Ordovicíco temprano de la Cordillera Oriental): sismita, regresión forzada o evento extraordinario? — IX Reunión Argentina de Sedimentología. Resúmenes:48.
3. Astini, R.A. (2003) : The Ordovician Proto-Andean basin. — In: J. L.Benedetto (Ed.): Ordovician Fossils of Argentina: 1–74; Secretaría de Ciencia y Tecnología, Universidad Nacional de Córdoba.
4. Artyushkov, E.V., Lindström, M. &Popov, L.E. (2000): Relative sea-level changes in Baltoscanida in the Cambrian and early Ordovician: the predominance of tectonic factors and the absence of large scale eustatic fluctuations. — Tectonophysics,320: 375–407.
5. Barnes, C.R.,Fortey, R.A. &Williams, S.H. (1994): The pattern of global bio-events during the Ordovician period. — In:Walliser, O.H. (Ed.): Global Events and Event Stratigraphy in the Phanerozoic: 141 – 172; Springer Verlag.