Jadoon S, Amin AA, Mahmood HK, Hamoodi DA, Sabir MFM. Determination of Trace Metals in Crude Oils by Atomic Absorption Spectrophotometry in Khurmala and Guwayar Oil Fields of Kurdistan Region, Iraq. ASRJETS-Journal. 2016;20(1):213-223. Accessed September 22, 2025. https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/1612