Jadoon, S., A. A. Amin, H. K. Mahmood, D. A. Hamoodi, and B. H. Mohammed. “Determination of the Total Sulphur Content in Khurmala and Guwayar Oil Fields of Kurdistan Region, Iraq”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 20, no. 1, June 2016, pp. 190-9, https://www.asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/1602.