Abu-Libda, O.A.M. “ Spatial Interpolation by Kriging Technique Applied to Pollution Assessment on Soil Zinc in Abandoned Mining Site at Kinta Valley ”. المؤتمر العلمي الثاني لعلوم البيئة، 2015م, Dec. 2015, p. 585, https://conf.asmarya.edu.ly/index.php/ces2/article/view/685.