Omar Ahmed Al-Badrani, and Faris Nejris Hassan. “Calcareous Nannofossils Bioevent Throughout the Cretaceous -Tertiary Boundary in Kh-4 Well, Northern Iraq”. Tikrit Journal of Pure Science 26, no. 1 (December 3, 2022): 60–66. Accessed June 18, 2025. https://tjpsj.org/index.php/tjps/article/view/100.