واخرون شمم ناصر راضي. “Effect of Some Environmental Factors on the Tolerance of Bacillus Subtilis to Heavy Metals”. Al-Qadisiyah Journal of Pure Science, Vol. 17, no. 4, Aug. 2017, pp. 38-48, https://journalsc.qu.edu.iq/index.php/JOPS/article/view/481.