& et al., Aweez. “APPLICATION OF SOME SINGLE AND INTEGRATED INDEX EQUATION TO ASSESS HEAVY METAL IN DIFFERENT SOILS IN ERBIL GOVERNORATE”. IRAQI JOURNAL OF AGRICULTURAL SCIENCES, vol. 52, no. 4, Aug. 2021, pp. 868-75, https://doi.org/10.36103/ijas.v52i4.1394.