K. S. . . Al-Bassam, “A Reconnaissance Study of Rare Earth Elements Systematic in Phosphate Coprolites: Comparison between Continental Shelf and Intracontinental Basin Deposits”, Iraqi Journal of Science, vol. 63, no. 6, pp. 2566–2581, Jun. 2022, doi: 10.24996/ijs.2022.63.6.23.