M. Taherpour Khalil Abad and E. Mojtahedin, “Biostratigraphic study on calcareous nannofossils in South Gorgan, North of Iran”, Iran J Earth Sci, vol. 9, no. 1, pp. 146–153, Oct. 2017, Accessed: Jun. 24, 2026. [Online]. Available: https://oiccpress.com/ijes/article/view/5805