Foroughi Fariba, Gardin Silvia, Lotfali Kani Anoshiravan & Vahidinia Mohamad, February 2017 — Calcareous nannofossil biostratigraphy of Campanian strata (Abtalkh Formation) from the eastern Koppeh-Dagh Basin, NE Iran. Cretaceous Research vol. 70, , p. 55-70 ISSN 01956671 https://dx.doi.org/10.1016/j.cretres.2016.10.002