L. N. . Ezzulddin and Y. K. . Ibrahim, “Biostratigraphy of the Early Cretaceous Mauddud Formation in Ratawi Oilfield, Basrah Governorate, Southern Iraq”, Iraqi Journal of Science, vol. 63, no. 6, pp. 2598–2607, Jun. 2022, doi: 10.24996/ijs.2022.63.6.25.